Sonic Generations/WMG

Time Eater ate several games that were never restored into the timeline

 * Such as Sega Sonic the Hedgehog, Sonic Chronicles, and Knuckles Chaotix, which explains why the Classic Chaotix never appeared. Time Eater is also the reason why Sonic Chronicles 2 was never made. These games were never restored into the timeline because, since Time Eater did all this in its primordial form, before Eggman got a hold of it, even the villains' actions were eaten so that they never happened, which is good for our heroes. Also, he erased Big's presence in this game.
 * Jossed in Big's case; he appeared as a cameo in the downloadable Casino Night Zone mini-game and as a statue in the Hidden Statue Room.

The entire franchise is caused by Generations.

 * Characters missing (Fang, Mighty, ect.), items never reappearing (Time Stones, Super Emeralds, Sol Emeralds, World Rings, Swords of Destiny), the change in character designs (Sonic Adventure), adventures never happening (Games not in this, 06). Time Eater is the cause of all of it.
 * Jossed.
 * And isn't Crisis City from '06?

Generations didn't cause the franchise, but several stable time loops began/ended here.
It's already been confirmed by the ending that Classic Sonic got the idea to boost from his older self, also he most likely learned the homing attack in this game (since it's purchasable). Classic Sonic had his first chili dog at modern Sonic's party. Eggman went "that crazy" partially because of his "time" spent in the white void of not-time. His successful experience with the Time Eater gave him a sort of hubris involving using Eldritch Abominations for his own gain, and we all know how that ended. Any other ideas are welcome.

Crisis City WON'T be saved from Time Eater's erasement.

 * Well, 1) It's a bad future, and 2) due to the fact that you have to restore the timeline Modern and Classic actually experienced. It might even be where Time Eater IS.
 * Jossed.

The new Egg Dragoon is the "Prototype 2" Eggman said he'd build after the original was desroyed.

 * As seen here, the Egg Dragoon has a variety of new features, including physical wings and a second craft resembling the Egg Wyvern.
 * Confirmed.

The game will have some sort of tribute to the memory of Michael Jackson.
Becasue it would be blasphemous not to!

The game will begin and end with Sonic celebrating his birthday party.

 * Since this is an anniversary game, this would make sense. In the beginning of the game, Sonic's birthday party gets crashed by Time Eater doing his dirty work, and once the time stream is fixed at the end of the game, the party continues where it left off.
 * Kinda like the Star Festival in Super Mario Galaxy.
 * Confirmed.

The game's final level will be a hodgepodge of all the other levels in the game.

 * Once the two Sonics beat all the other levels in the game, time eater decides to create a time/space rift where bits and pieces of all of the levels are revisited, but are made much, much harder because, well, you know, it's the final level.
 * Much like the true final stage of Sonic '06. Hopefully without this time.
 * This could also possibly be used as a way to include other levels from the respective games that weren't used here and even levels from Sonic games not represented in-game (whether in their entirety or as nods in other levels already present).

We're gonna get Hyper Sonic.

 * Two Sonics... so, maybe, fourteen Emeralds -- or seven Super Emeralds!
 * Jossed.

There will be an option to switch between characters.

 * That's right. Look up the entry under The Dev Team Thinks of Everything, and see (as conveyed in the video) how sad it'd be to see each era of Sonic restricted to their gameplay styles. If it IS intended, however, you may have to complete the game on a first run, though.
 * Semi-Jossed. You can switch, but only in the hub and in one boss.

Classic Sonic is overwriting Modern Sonic's memories.

 * Think about it. If Classic Sonic is supposed to be the childhood of Modern Sonic, then everything Classic Sonic experiences, Modern Sonic will remember. For example, Classic Sonic will notice the classic levels are different from before, and Modern Sonic will remember that. However, events from the modern games, Modern Sonic will remember as being different from when he encountered them as Classic Sonic, which could possibly override his memories of when he properly encountered them. For example, Modern Sonic will remember that the GUN Truck chasing him is different from when it chased him as Classic Sonic, but not remember it as different from when it chased him in Sonic Adventure 2, since the events of this game would overwrite that history.

The GUN Truck has been modified with Eggman Nega's future technology.

 * How else can it drive alongside a building? Also, given its insane driving moves, intent on killing both Sonics, and the utter disregard for property damage and civilian casualties, this troper is convinced that there is no one behind the wheel, and the truck is now DRIVING ITSELF! Nega upgraded a lowly capture truck into a weapon-equipped, self-aware Boss in Mook Clothing!
 * The truck driving itself would be a brilliant Shout-Out to Stephen King's Maximum Overdrive!
 * Jossed as far as we can tell. There's no mention of Eggman Negative at any point in the game.

The "mysterious villain" who causes the time holes is Eggman Nega.

 * They will go with the 'Rivals' origin for him (as the descendant of the Robotnik family). Given how much he likes to screw with time in his plans to destroy the world, Nega could create a time paradox. They can even give him a classic design! After all, he is just a reused concept of Bee-Robotnik.
 * ...You are brilliant.

Classic Sonic will be voiced by Roger Craig Smith doing a high pitched voice.
No wonder Sega asked him to do a deep voice for Sonic in Colors.
 * Semi-confirmed: Classic Sonic's VA is Smith, but even though he'll probably be using a high-pitched voice for him, we don't know yet.
 * Jossed by SEGA. Classic Sonic is confirmed to be voiceless, and any conclusions to the contrary were due to the trailer editor throwing modern Sonic voice clips in with the classic part of the trailer for the heck of it.
 * Well, it was just a trailer.

Blaze will be redrawn in the classic style

 * Why?
 * Because she is an alternate-universe counterpart of both Sonic and Knuckles.
 * That doesn't explain any sort of Classic-style Blaze appearing. Also, having Classic Blaze (or any post SA-characters) will most likely set the fanbase on fire.
 * But... it's an anniversary game. They can't just focus on pre-SA.
 * They meant that a pre-Adventure version of a post-Adventure character would be unlikely to show up.
 * Well, isn't Blaze from the future now, not an Alt Dimension? She time traveled at 15? And Classic Sonic is now 'Young Sonic', being about 10? Oh, never mind. It makes as much sense as Classic Tails, who would be about 3 years old according to this retcon.
 * Jossed.

This will be the Wii HD's pack-in

 * Why would Nintendo pack-in a Sega game?
 * At least, it might appear on the console, much like how Sonic the Hedgehog 4 appeared on iOS out of freaking nowhere.
 * Jossed. But a 3DS version is confirmed.

Classic Sonic will be voiced by Jaleel White.
Why? It would make a brilliant Mythology Gag, that's why!
 * Jossed.

Other "Classic" counterparts of other characters will appear.
Most likely Eggman/Robotnik, Tails, and Knuckles, since they've been around since the Genesis days.
 * Classic Tails is confirmed.
 * Also Amy, who was there before Tails and got one of the most noticeable redesigns.
 * Then there's Metal Sonic, who was Sonic's rival way before Shadow.
 * Confirmed by Sega. Image.
 * The Chaotix. They were in Knuckles Chaotix.
 * Not likely, since Sonic Team retconned it out of existence, and retooled them as a detective trio in Sonic Heroes.
 * It seems that the Chaotix are in. But it seems unlikely that we'll see Classic Counterparts for them..
 * Classic Eggman on a sign post was seen in one of the gameplay videos accompanying Takeshi Izuka's interview, so confirmed for him at least.
 * Classic Tails now makes no sense. Classic Sonic is supposed to be a younger Sonic, about 10? That makes Classic Tails 3. A 3 year old. Unless Tail's isn't 8 anymore. Sega can't keep their canon straight. Tails needs to be aged up to 12 or 13. Amy is still 13 in Modern continuity? She barely scrapes by then.
 * Sonic Jam's profile of Sonic says he's 16! How is that supposed to keep the canon in order?!
 * No, Tails does not need to be aged up. He's 4 in Adventures of Sonic the Hedgehog... Think of it this way: Classic Amy is 8, Modern Amy is 12. So, 4 years, having Classic Tails at 4, and Classic Sonic at 11.
 * Tails was 8 around the time of the Sonic Adventure games, and Sonic was 16. If we assume Sonic is now 20 (being his 20th birthday or whatever) and it's been around four years in-canon since Sonic Adventure, then Tails is currently 12. Assuming a huge amount of time didn't pass between the classic games and Sonic Adventure, classic Tails is 5 or 6 and classic Sonic is around 13.
 * Wrong. Sonic was 15 in Sonic Heroes.

Classic Tails is 3 or 4 years old, and it makes sense.
He's a fox. Canids reach sexual maturity at one year old at the latest. As for young Sonic? They're anthropomorphs. Nobody ever said the amount and type of human traits they have need to be consistent.

Classic Sonic will be voiceless.
Because he never had any dialogue in the Genesis games.
 * Confirmed by SEGA.

The game will be a Crisis Crossover.
The use of old and new in tandem with each other suggests this.
 * Possibly. This could be similar to what happened in Turtles Forever, regarding TMNT.
 * It will thus establish the classic games as belonging to a different continuity than the more recent ones. As a result, the fans will eat each other alive over the relative canonicity of Sonic the Hedgehog 4. In addition, and just like in TMNT, Classic Sonic will be portrayed as goofy and cartoony, thus further angering the fans.
 * For the love of God! WHY?!
 * Everybody can breathe now. We are dealing with time travel and not the multiverse.

Classic Sonic was Modern Sonic before he went through puberty.
Classic Sonic was apparently 10 during the events of Sonic 1, and there was a five-year Time Skip between that and Sonic Adventure.
 * Apparently confirmed. Classic Sonic is Sonic as a kid.

Both Sonics will merge into one new Sonic design that will appeal to both Classic and Modern audiences.
Why not?
 * Because that's impossible.
 * Not possible. Adventure is now 'Older Sonic', being 15 and Classic is now 'Young Sonic' at 10.
 * There is this guy.
 * There's also the fact that the Modern Sonic design is a fusion of the Adventure design and the Classic design in the first place.

The first trailer is purely allegorical.
The game will actually be a compilation of various remastered levels from the series, with no plot whatsoever.
 * Semi-Jossed. While there's levels from previous games, there IS a plot.

There will be two styles of gameplay.
Modern Sonic will have the style of Sonic / Sonic Colors, while Classic Sonic will have the style of the Sonic Adventure games, especially the first one.
 * What.
 * Perhaps Modern Sonic will have the Unleashed / Colors style, switching to and from 3D and 2.5D. Classic Sonic, though, might always play in a 2.5D environment.
 * Confirmed.
 * I guess I'll be the one to point out the obvious: that doesn't make sense. Why would the Sonic that premiered in SA not get SA-style levels? Additionally, the Unleashed-style levels bear a great resemblance to the oldschool stuff by virtue of being 2D half the time. Seems like the reverse of what you said would make more sense.
 * Guess no more.

There will be some clash between the old and the new.
Due to the differences between the Genesis games and the Post-Sonic Adventure games in both gameplay and the the character's personalities, this is almost inevitable.
 * For example, Modern Sonic is confused at why Classic Sonic is so fat, and why Classic has to pump his hands when he runs rather than Modern's method.
 * I'm wondering why he pumps his hands at all when he's at full speed; Sonic keeps his arms bent close to his body when at top speed in the Genesis games.
 * Semi Jossed. C. Sonic learns the homing attack from M. Sonic.

Both Sonics will have exclusive moves.

 * Classic Sonic won't be able to wall jump, since he hasn't done them in his games. Modern Sonic might not be able to do a Super Peel Out, because he technically wasn't in Sonic CD. They may also share moves, like the double jump, a la Sonic R and Colors.
 * Confirmed. Classic Sonic has the Spin Dash and Spin Attack. Modern Sonic has the Homing Attack and Speed Boost.
 * And in the 3DS Version, Classic Sonic plays just like the classic games, while Modern Sonic plays similar to the Sonic Rush games, so the latter has the Boost as well. Um, does anyone know if Modern Sonic has the homing-attack in the 3DS version?
 * The homing attack is part of Modern Sonic's moveset in the 3DS game.
 * Confirmed.

Sonic learned his Bird Run from himself.

 * Past Sonic learned from modern Sonic that running at incredibly high speed is easier that way, as his arms will be floating of the air resistance rather than fighting against it, as well as serving as balance aids; classic Sonic then replicates this in Sonic CD.
 * Yes, but CD came before Sonic 3 (and probably 2). Why would he stop doing the Bird Run if he found it more efficient?
 * Actually, CD is now chronologically set between Episode 1 and 2 of Sonic the Hedgehog 4. So...
 * That doesn't make sense if 4 = Modern Sonic and CD = Classic Sonic. I think people were reading too much into that vague hint about CD being connected to 4.

The villain changing time is

 * Out to take revenge for being forgotten by everyone and for Sonic taking the role that was meant to be his.
 * That sounds very similar to that lucky rabbit.
 * Jossed

The cause of the "time holes" is .

 * As such, the creation of the time holes could possibly be the master plan of.
 * I could see Mephiles/Solaris being behind it... somehow. Even if they don't exist anymore. I mean, time travel is so messed up in the Sonic-verse it makes sense that they could still exist in some shape or form somewhere.
 * That's the exact same thing I was going to post, only with an addendum: The plot to this game will not only fully incorporate Sonic 06 back into the canon, but it will also do it in a way which will rescue Sonic 06 (at least story wise) from the Scrappy Heap. Yes, it is going to be *this* awesome.
 * Mephiles can exist in any time before or after the section where he was erased, and could therefore bide his time in the fragments of the Sonic 06 timeline in a ploy to get Blaze. After all, of Sonic 06 erased itself, why didn't Blaze come back? Because she was in another dimension and therefore exempt from the ret-con. So Iblis is still within her, hence why she didn't want to make friends so easily.
 * If Mephiles is behind this, we could finally get an explanation for his omnicidal mania.
 * And now that the villain's name is revealed to be the "Time Eater", it is very likely that this is an alias for Solaris, since eating time is something that he can do.

The game will lob a Take That or two at Sonic the Hedgehog 2006.
Mainly as a bit of Self-Deprecation on Sonic Team's part.
 * For example, Modern Sonic will bring up the time he kissed a human, clearly disgusted at bringing it up. Classic Sonic is also a bit disgusted, but for one other reason...
 * It's hard for Sonic to express disgust at kissing a human, considering he never did. It's also hard for him for show disgust at being kissed, considering that he might have not known it had happened. You know, due to the whole "being dead and revived into his Super Mode (complete with the bright light obscuring EVERYTHING) within the span of five seconds" thing. And the "him not being nearly as butthurt as some people were about the Interspecies Romance" thing. That whole "the plot of the game didn't happen" thing might count for something too.
 * Levels from 06 show up, but the two Sonics agree that they aren't worth completing. They can still be completed For the Lulz, but the game clearly question's the player's taste if they do.
 * The level would be completely reimagined and amped up in quality. What would be the point in guilt tripping people for playing it if it didn't actually doesn't suck anymore?
 * They might point out that they don't remember being here before.
 * Not really Sega's style. Maybe the writers, but I think Sega would say 'Flat No.', but then, they are removing all the 'sub par' Sonics from Metacritic or something.
 * Semi-Confirmed. The leak from the demo indicates that Crisis City from 06 will be one of the levels in the game, representing part of the modern era. Silver is also one of the rival bosses in the game. So yeah. How the plot is going to incorporate them is anyone's guess.
 * Jossed; the only stages on which remarks are made are Green Hill and Chemical Plant (and if you complete it with Modern last, Sky Sanctuary).
 * Moreover, M. Sonic actually promises C. Sonic that his best days are ahead of him.

Levels from both eras will have modifications to fit each Sonic's playstyle
Classic stages will play on a 3D/2D plane when playing as Modern Sonic, while modern stages play on a 2D plane when you play as Classic Sonic.
 * Confirmed with the trailer for Sonic Adventure 2's City Escape stage.

Part of the plot will be both Modern and Classic Knuckles being duped.

 * Both echidnas are incredibly gullible, and it's a old Running Gag.
 * Jossed. Only Modern Knuckles is in the game. And he never directly interacts with Eggman.

This will be a typical cutscene.
"Modern Sonic: There you are! I bet you just trashed that giant beaver dolphin robot thing.

Classic Sonic: -0

Modern Sonic: How do I know? Well, that's because I was there, when I was you.

Classic Sonic: -/

Modern Sonic: That's right! I know everything you are going to say. Strange, isn't it?

Classic Sonic: ;-)"

This game is doomed.
(NOTE: Given that a) this was so thoroughly jossed I don't even know why this was deleted before, b) we don't need to open old wounds here, and, most pertinently, c) for some ungodly reason, this WMG devolved into an argument about the relative merits of Sonic Unleashed, this has been deleted for your continued pleasure. You're welcome.)
 * Let's look at this. Extremely vague, short, shallow trailer for a 3D Sonic game made for an anniversary only released for the HD systems that absolutely must be released this year. Where have we seen this before?

Some elements from the Sonic 1 beta will appear.

 * Remember the Sonic Band? They could appear in this game's sound test. Madonna, the scrapped love interest, might even make an appearance... as a Take That to the folks who are still sore about Elise.
 * Somewhat confirmed, at least by Classic Sonic's victory poses when he hits the signs, which he was originally intended to do.
 * I'd like to see the Marble Zone UFOs or some of Sonic 2's Lost Levels myself.
 * Confirmed. Vector plays keyboard in a challenge.

Past levels that had a gimmick will retain them.

 * The entire game is generally about time travel, so stages from Sonic CD wouldn't feel right without the gimmick. Also, if any Colors stages return, they might feature Wisps. City Escape could even bring back the awesome snowboard.
 * Confirmed, City Escape has Modern Sonic on the board, and Classic Sonic gets a skateboard for a section as a nod to Sonic 3.
 * So that means we will get to see Swordplay and Werehog?
 * Interesting point. There is a possibly that a Black Knight level won't appear. This might carry over for the Werehog stages, because Modern Sonic plays similar to the day stages.
 * Spagonia is referenced on one of the City Escape billboards, it's a possibility.
 * Sega is only using games from the main canon, so no Secret Rings or Black Knight stages (or Advance stages, unless those are being saved for the 3DS version). If Unleashed stages are in, they'll most likely be cleaned-up daytime stages, or daytime versions of the night stages (most likely if Eggmanland is used). Now confirmed for the latter part, Spagonia's Rooftop Run stage is in the game.
 * A Werehog icon has been discovered in the game. Same thing for Pink and Orange Wisps.
 * The Werehog icon was just a left leftover from Unleashed HD. He is not likely to appear in the game.
 * The Werehog does appear... in an archival still frame in the credits.
 * This game confirm's Sonic and the Secret Rings as part of main canon there by making Sonic and the Black Knight canon.

There will be a Sonics Schoolhouse based level

 * Perhaps Classic Sonic's Old Shame?
 * Jossed.
 * Nevertheless, in the post-credits stinger. Quite a sly little reference, innit?

Classic Sonic is silent...
...because his voice has just started to crack. It sounds weird and he's embarrassed of it, so he deliberately refrains from speaking.

Metal Sonic will appear, in both his CD and Heroes iterations.

 * If they might be doing both Robotniks, this is certainly possible.
 * Semi-confirmed in CD Metal Sonic's case, for now.

Big the Cat dies.
Every prior anniversary had someone die.


 * 1) Adventure 2:
 * 06:

Also, he's a very hated character.
 * Sega can't be that desperate to win back the "Big Hatedom", can they?
 * He hasn't been a required playable character ever since his debut (not counting the level he's introduced in Sonic Chronicles, but even then, you can go through the rest of the game without him, and even THEN, a lot of people consider Chronicles Canon Dis Continuity anyways), and Sonic Team seems perfectly content with including him in games as a mere Easter Egg. Apparently, he has enough of a fanbase to warrant the production of action figures. He could easily be Rescued From the Scrappy Heap by throwing a few more IQ points his way. Not to mention that killing any characters would go against the Reverse Cerebus Syndrome that Sonic Team has been going for as of late.
 * Big won't die. Not to mention the ones you mentioned either came back to life, was never dead in the first place, died long before the events of the game happens, or were bosses who had to be eradicated anyway.
 * If Sonic is becoming less serious, they could play Big's demise more for dark comedy than sadness. Problem solved.
 * Jossed.

As for how Big dies

 * He attacks Sonic again, but this time, he means business. Sonic ends up attacking him a little too hard, which hospitalizes him. He can not afford the bill for surgery, so he passes on.
 * Again, Sonic Team is going for the Reverse Cerebus Syndrome treatment here.
 * Maybe it's more Black Comedy than sadness.
 * Or he hangs himself or is killed by Eggman.
 * Or he gets torn in half by a Portal Cut.
 * Jossed.

Big will not die in his cameo appearance.

 * You guys are sadistic bastards.
 * Even BETTER...
 * Jossed.

Big will pull a Crowning Moment of Awesome involving a oversized Froggy.

 * The team will be trapped against a corner with the boss ready to kill them... Bonus Points if the crew does some Lampshade Hanging on the Took a Level In Badass trope.
 * Jossed.

Big will be turned into a non-anthropomorphic cat
Because of the lighter tone, and this would effectively kill him, maintaining tradition while retaining a light tone.
 * Jossed

the New Villain is...
A. Harold Saxon/The Master B. A Face Heel Turned Silver C. The Doctor Himself D. Trunks E. Mephiles F. Eggman Nega G. Doc H. Axl Low

Please note that they are all time travel related.
 * Silver does appear as a boss. Not quite sure if he's the Big Bad, though.
 * Jossed.

Modern Eggman unsealed this game's Big Bad/Bigger Bad.

 * After trying to defeat Sonic with his Mecha-Mooks and failing in Sonic Colors, he went back to this longtime habit.
 * Jossed. Modern Eggman

There will be a new incarnation of Shahra/Merlina.
She will once again get more spotlight than any other NPC.
 * One problem: this isn't a Sonic Storybook Series entry.
 * Jossed. Shahra does get a reference, though.

The Main Villain Is Metal Sonic.
After he escaped in Sonic Free Riders, he comes into contact with the Metal Sonic of the past and they come up with a plan to take over the past and future worlds.
 * Eh, what would Metal Sonic gain from this? Really.
 * A true rematch in Stardust Speedway? At least the fans would like that...
 * Actually, Metal Sonic was ranting about a Machine Empire in Sonic Heroes, so perhaps he wishes to create a nightmare future ala Terminator.
 * He would gain the one thing he ever wanted: To destroy Sonic. So he felt, why not get help from his past self and kill both Sonics?
 * Jossed. Classic Metal Sonic only appears as a Rival boss.

Assuming the Nintendo 3DS version is real... (from the time of this writing, it was not confirmed yet)
It will get exclusive levels from the Sonic Advance trilogy and Sonic Rush series. Specifically, when the Classic and Dreamcast levels are done, the Modern sections will take a turn into the handheld titles.
 * I'm expecting more Game Gear levels in, especially Sunset Park. If only for the freight-train boss with awesome music.
 * Possibly confirmed. Nintendo Power has confirmed that Green Hill is the only stage shared between the 3DS and Console versions.
 * Also, the dev team is looking into previous handheld levels for the 3DS.
 * Confirmed. Water Palace is present, and Classic Sonic's version of Tropical Resort is based on the DS version rather than the Wii version.

Classic Sonic Will Have At Least ONE Line in the Entire Game

 * Most likely at the end, where both Sonics bid farewell to each other, and before Modern Sonic returns to his time, Classic Sonic speaks at the very last moment, much to the surprise of Modern Sonic. Very likely to be if true.
 * It could also be a Call Forward of Classic Sonic becoming the new Modern Sonic he ventured alongside with throughout the entire game. Since the game's theme is Time Travel, doesn't this mean that...
 * What if Classic Sonic only utters a single word in the entire game?
 * And the voice will be DAN GREEN! ... I mean Ryan Drummond or Jason Griffth, just as a Take That to the fans. ;P
 * Jossed.

There will be a Captain Ersatz of Sally Acorn in this game.
Because so many people would just love to see Sally Acorn in a Sonic game, and whilst companies that own rights to Sally may get generous enough to offer her use for just this one game, Sonic Team wouldn't want her enough to buy rights to her; thus, we get a character somewhat reminiscent of her.
 * Maybe the "mysterious villain" is Sally?
 * Jossed
 * Somewhat reminiscent of Sally? Perhaps Tiara from Sonic X-Treme?! Elise from 06?

This game will be full of Easter Eggs.
All harkening back to the development of the characters; for example, someone else said that Sonic's band and his girlfriend Madonna, from back when Sonic's character wasn't finished, may show up, though only as Easter Eggs and not as NPCs, as they never existed in the timeline this is set in. (It could end up being a 'possible future' Sonic, I suppose, since the future can't be 'set'.) There's also bound to be a lot of information on the conception and development of characters coming to light with the release of the game.
 * Confirmed. In the room with the art and music, you can enter a secret trophy room.

This game will reboot continuity.
Partly to freshen things up, and partly to make things for the Unpleasable Fanbase work out.
 * According to an interview in Nintendo Power, this is going to happen for the Archie Sonic series as part of its Sonic Generations tie-in (a 4-parter called Genesis.) It also mentions that
 * I think it's.
 * This troper would, and, so I'm going to say Jossed.
 * Or maybe it's.
 * Jossed.

Sonic changing eye color...
...will either either A) be treated as a Noodle Incident or B) actually happen on-screen to Classic Sonic at the end of the game, possibly as a side effect of a Phlebotinum Breakdown.
 * Puberty makes the most sense. Humans gain more hair, hedgehogs get more colours. :P
 * Call it crazy, but maybe Sonic's vision really got bad over the years, and he wears green contacts?

The 3DS version will also have two gameplay styles.

 * Classic Sonic will have the Advanced gameplay style, while Modern Sonic will use the Rush one.
 * Classic Sonic plays similar to the console verison. Modern Sonic uses the Rush/Colors DS style.

The opening theme will be a remixed version of Sonic Boom.

 * Because the song is that cool.
 * Jossed, unfortunately. At least there's an awesome remix of Sonic 1's theme.
 * Considering Crush 40 have covered it at Sega's recent Sonic Boom event, I'd wager it'll be used as Metal Sonic's boss theme, or in the credits. Or just stuck on the soundtrack, since it's a fan favourite song.

Classic Dr. Robotnik's henchmen will be a Clucker, a Grounder, and a Coconuts.

 * As a reference to The Adventures of Sonic the Hedgehog, which will have Modern Dr. Robotnik remember why he got rid of those three in favor of Orbot & Cubot.
 * ...Hey, that would actually be kinda cool.
 * That. Is. Amazing.
 * Jossed.

Ristar will somehow make an appearance.

 * In a way, he's the Oswald to Sonic's Mickey. Bonus points for Ristar actually being significantly built up from a rabbit, which happens to be one of Sonic's prototype designs.
 * Since there's two "Mickeys" (Both Sonics), maybe there's two "Oswalds". Ristar and Mighty partner together to claim the title they both believe they deserve.
 * Jossed.

As will Alex Kidd.

 * It's more faint than Ristar, since Kidd's not at all related to Sonic other than being Sonic's predecessor mascot. His recent appearance in Sonic & Sega All-Stars Racing could be used to justify another appearance, however.
 * Jossed.

As well as anyone from the sega timeline not involving Sonic.
They're pissed at the fact they are stuck while Sonic is the company's favorite.
 * Jossed

Classic Sonic will be competing in the 2012 London Games.

 * New characters are added for each Mario & Sonic game. With all the Generations hype, it seems natural for Classic Sonic to be in the action. He can also compete with his old rival, Mario.
 * DEMAND CLASSIC MARIO FOR CLASSIC SONIC! How could Nintendo DARE to change him from being red-brown to blue-red?!!1 BRRRRING BACK THE RED SUSPENDERS!!!1
 * Don't you dare start.
 * HOW DARE MARIO WEAR A SHORT SLEEVE SHIRT?!1 MARIO'S Ruined FOREVER!!
 * Oh you.
 * HOW DARE THEY THINK SONIC IS BETTER THAN MARIO DUE TO THIS GAME! START A FLAME WAR ON THE DISCUSSION PAGE!!!11ONEELEVEN!1!1!! (Not really, It was a joke.)
 * Jossed. Only the 20 characters from the Winter games are confirmed.
 * There's always the possibly of an alternate costume for Sonic.
 * Or having Classic Sonic as a Hidden Character you can play as after meeting certain criteria, or more likely an unplayable boss in a running event.
 * And he could even be offered as Downloadable Content.

Sega created Sonic the Hedgehog 4 as a way to throw people off about Classic Sonic's return.

 * The developers intentionally went with the Modern design to make people think that they weren't going to make Classic Sonic a playable character. They also went further to justify it by making Classic Sonic Modern's younger counterpart. This is only supported by the fact that it started development after Sonic Unleashed wrapped up.
 * Classic Sonic is Young Sonic. Sonic 4 is Puberty Sonic.

Classic Sonic will end up injured at some point near the end of the game and pull some Doctor Who-style regeneration.
To explain why Sonic looks the way he does now, disregarding the theory that classic Sonic is Sonic at 10 years old, this is also supported by Robotnik in one episode of Adventures of Sonic going "one trouble-making teenager has made me pull every hair from my beautiful head".
 * Jossed.

The Time Stones will have something to do with the plot.

 * The new villain, hearing of their power, gets his/her/its hands on them. The villain and the Time Stones' power are the ones causing the time holes to open up.
 * Jossed.

The 3DS Version will be Better Than It Sounds.

 * Yes, Dimps is involved, but they're co-developing along with Sonic Team, which is promising. Also, to those complaining about Modern Sonic's gameplay being based on Sonic Rush Series, Sonic Team has been listening to the fanbase a lot recently, and it's likely they've heard any complaints about Rush the fanbase has had. I'm not saying that those complaining about this are Fan Dumb, but maybe they're overreacting a little? We haven't even seen any of the 3DS version, and only a little of the console version.
 * Some fans were probably stained since Sonic Team and Dimps co-developed Sonic the Hedgehog 4, too. A game that used a modified Sonic Rush Series engine in the end. Some fans probably don't want to take any changes again, since they believe that this alliance will affect the Classic gameplay, as well.
 * Except that Dimps worked on the Sonic Advance series, too, and that was well-received (or, the first one was, anyway). And I know why they're all so worried about Dimps co-developing (because of Sonic 4), but chances are they're only working on the Modern gameplay. Which is why they're only co-developing. Maybe.
 * But yeah, we shouldn't really assume anything, yet. We just have to wait to see how much different the 3DS version will be from the console version.

Prior to the final boss, both Sonics will undergo a Boss Rush of the final bosses from their respective generations.
Possibly going in opposite directions in time in order to both arrive at the final boss in the middle. Something like this:

Modern Sonic: Sonic Colors --> --> (Transform into Super Sonic) --> Sonic Unleashed --> Sonic 2006 --> Shadow --> Sonic Heroes --> SA2 --> SA

Classic Sonic: Sonic 1 --> Sonic 2 --> Sonic CD --> Sonic 3 --> (Transform into Super Sonic) --> Sonic & Knuckles

After completing both, the true final boss would be unlocked, involving both Super Sonics. Why? Because it would be pretty awesome.
 * With the possible exception of Sonic 2006 and Shadow due to the former's Canon Dis Continuity and the latter's... not having Sonic. Plus, removing those two would give each Sonic exactly five bosses to complete.
 * Oh how I hope this is true. A time-travelling pincer strategy would be more epic to this troper than the final blow against Colour's final boss.
 * Jossed.

Classic Sonic will have Super Sonic unlockable for his stages, while Modern Sonic will use it for the final boss.

 * In order to mimic the trends set by both generations.
 * As of Sonic Colors, it seems perfectly possible that Modern Sonic can unlock Super Sonic too.

Hyper Sonic (and possibly something beyond) will appear in this game, and be playable as both Sonics.

 * Rule of Cool aside, the Sonics go through 3 different eras, so who's to say there won't be three sets of Chaos Emeralds as long as they put all of them back in their eras.
 * If the Emeralds are capable of warping time, chances are there will only be one set of Emeralds throughout, but their chaotic nature makes them change colors.
 * Jossed.

The Death Egg will play an important role in the game.

 * At some point, the unknown enemy will use the Death Egg to complete his plans of taking over space and time.
 * The upcoming Archie Comics' Sonic the Hedgehog arc involves the Death Egg doing similar things as in Generations. The fact that it could be a tie-in helps this guess.
 * Not necessarily. All we know is that
 * Not necessarily. All we know is that

Classic Sonic will have but one line at the end of the game:

 * "I'm outta here."
 * Jossed.

At the end of the game, Modern will offer Classic words of wisdom for the future.

 * More precisely, he will encourage Classic to never give up hope; no matter how rough things will get in the future, it'll eventually turn out alright. Not only does this serve to explain Sonic's unwavering happy-go-lucky attitude (he knows things will be okay, because his future self told him so), it's a meta-commentary on the rise, fall, and re-rise of the franchise.
 * "If the two-tailed fox can keep up with you, he'll be your friend for life. Take good care of him."
 * "If you meet a pink hedgehog, be reasonably nice to her, but if she starts charging at you, RUN AWAY. Especially if she's holding a large hammer."
 * "Don't be too angry at the red echidna, he can't help being that gullible."
 * "Keep an eye on those birds. Rings won't be the only thing you lose!
 * "That weird walking water dude isn't so bad. He's just misunderstood."
 * "The black hedgehog has lots of issues, you'll need to be patient with him."
 * "True friends that stay beside you are your real superpowers!"
 * "Whatever you do, do not let any creepy cultist aliens have their way with the planet."
 * "Soleanna's a boring place. Just avoid it. Trust me."
 * That could be the Take That the WMG talking about a Take That to '06 was talking about.
 * "If you start changing into a monster every night, don't freak out too much. It won't change who you are inside."
 * "Eggman may be up to his old tricks, again, but don't worry. Just stop his plans and take him out like before!"
 * "If Eggman starts claiming to have reformed, don't believe him for a second."
 * "The plumber isn't such a bad guy when you get to know him. You probably won't believe me when I say this, but you'll both look back and laugh about this whole thing in the future."
 * "Try to stay away from a weird cardboard box. The snake inside it doesn't like hedgehogs!"
 * "Try to make sure the bat thief and pink hedgehog don't kill each other."
 * "Don't let Eggman do your shoe shopping!"
 * "Show that hawk you're the fastest thing alive!
 * "If some bear and his bird friend challenge you to a race, just go with it. Just remember, this isn't the first time you'll have to race, and it probably won't be the last."
 * If you end having adventures with the Arabian Nights, or The Knights Of The Round Table, use the Seven Rings or a golden sword."
 * Dude, I would love to see that happen. I won't keep my hopes up about the word about Mario, though.
 * Don't be too wishy-washy on that QUIET yet. Sega did have him in THEIR olympic games which I like.The only thing I can agree on is the snake thing. Also, in the 3DS version of Metal Gear Solid Snake Eater, there is a Yoshi doll in the jungle, as Nintendo Power said.
 * I'd like to see this as well. It might just count as a Crowning Moment of Funny, Crowning Moment of Heartwarming, Crowning Moment of Awesome, AND a Tear Jerker all at once!
 * Confirmed.

Most of the achievements/trophies will be named after Mythology Gags, Call Backs, past stage names, and various quotes from the Sonic series.

 * The All-Stars Racing devs had a lot of fun with Sega lore with their achievements, so why not do the same thing with Generations?
 * I'm Outta Here: Keep Classic Sonic waiting for 3 minutes.
 * Get A Load Of This: Unlock a piece of bonus material.
 * The More, The Merrier: Collect 200 rings and complete the stage.
 * The Real Superpower of Teamwork: Beat a Co-Op Mission without dying.
 * Collision Chaos: Defeat 100 enemies just by boosting into them.
 * I Can't Believe It: Unlock all of the modern and classic modes of all characters.
 * Reach For The Stars: Spring 100 feet in the air on the space level.
 * Endless Possibility: Never let the boost gauge reach zero.
 * You Can Do Anything: S-Rank every stage.
 * Terminal Verocity: Ground-pound 100 enemies.
 * There Is Only One: Defeat Metal Sonic.
 * Do You Know Who I Am?: Defeat Shadow.
 * It's Still No Use: Defeat Silver, after losing to him once.
 * Sonic's School House: Use all the moves at least 10 times.

The real villain is Omochao

 * He's quite upset most people don't like him. So, he's trying to change time in an act of revenge.
 * Jossed. Omochao appears as a guide for the two Sonics, and only if you turn his help on.

The Special Stages in the console version will be based on the Special Stages of the Genesis Sonic Games And Sonic CD.

 * The first two will be based on Sonic 1's bonus stage. The next two will be based on Sonic 2. The Third stages will be Sonic CD based. The Bonus stage of Sonic 3 will be the final stage.
 * This will also be an important part of the game as this might unlock the final level and Super Sonic.
 * Isn't Sonic 2's the Fan Favourite?
 * Jossed. No special stages available.
 * And the 3DS version uses the Sonic Heroes special stages.

The villains behind the time holes are Classic and Heroes Metal Sonic

 * Think about it, Metal Sonic's fate was left in the air after the events of Sonic Heroes. Classic Metal Sonic's first appearance involved TIME TRAVEL. Heroes Metal could have gone back in time and got Classic Metal to help him.
 * Jossed. While Classic Metal Sonic is in the game, Heroes Metal Sonic is not.

This game will be ported to the Wii U.
Considering the system's specs, as well as the series's generally greater success on the Nintendo consoles/handhelds, it would make a lot of sense for them to bring it over eventually.

The villain is Sonic himself

 * For the wrong reasons. Sonic suddenly snapped after Sonic 4's extremely mixed reactions and destroyed the Time Stones, causing a Temporal Paradox which places Classic Sonic in the wrong timeframe. After realizing what he's done, he sets out to fix the time holes with his classic self, never telling him what actually happened.
 * Or it could be an old Future Sonic who's become bitter and decides to try committing griefless suicide by killing his past self. It would explain why the Sonics keep finding themselves where there's a ton of conflict going around, such as the city with the G.U.N. truck.
 * Wait... First off, what causes Sonic to become suicidal? Secondly, I highly doubt even a bitter Sonic would let his past self die, lest Eggman take over.
 * Also, plotlines like these are why most of Sonic's past games got huge amounts of criticism. Doubtful that a suicidal Sonic would ever appear in this game.
 * Jossed.

Alternatively, the villain is a Sonic.
Specifically, a Darker and Edgier version of Sonic. This is a Well-Intentioned Extremist version of Sonic, who is trying to Kill and Replace the other Sonics -- all for the purpose of giving the universe a "more devoted and pragmatic hero." What could create such a Sonic? Well, remember one of the bad endings in Sonic 2? The one where Tails appeared as a constellation? You know where that led. This Sonic became far more extremist due to this. His Eggman is not the Affably Evil mad scientist we know and love, but a Complete Monster on the level of his TV counterpart. Alternatively, this is a Sonic from a Bad Future. From Sonic Colors, we know Eggman can get to Moral Event Horizon levels. This Sonic is from a future where Eggman became a Complete Monster, and has made Sonic's life miserable. And Future Sonic is trying to replace his past selves.

The time portals are a way for this Sonic to alter history with abandon, and remain immune to a Temporal Paradox. Through subtle implications, they can describe this terrible world without it increasing the ratings beyond E. Much like how Nintendo added so much Fridge Horror to, yet they got away with it. This Sonic could also serve as a subtle Self-Deprecation to SEGA making a habit of games more Darker and Edgier and less Rule of Fun oriented. And, if I'm correct, the alternate Sonic could look just like Ashura. For the nostalgia giggles.
 * Or perhaps SHOW the terrible world and get a rating beyond E. Maybe he brings back Tikal/Maria and manipulates them, and/or kills Big.
 * Jossed.

Classic Sonic will be able to unlock more of his moves.

 * While his look is supposed to be based on Sonic 1, his moveset seems to be based on Sonic the Hedgehog 2, thanks to the Spin Dash (as well as the possibility of Super Sonic). With this moveset currently out in the open, the next best thing would be to unlock the ability to use, or in some cases reuse, his Insta-Shield from Sonic 3 and Knuckles, as well as being able to grab the shield powerups from that game and use their moves, as well. All of this being a part of one big Call Forward.
 * Confirmed by this video. Which was done by a hacker of the first demo.
 * Making Sonic CD's Super Peel-Out unlockable would be a dedicated bonus.
 * Confirmed by this thread after the second demo was hacked.
 * And on the 3DS side of things, Classic Sonic learns the Homing Attack just in time for the Dreamcast era levels.

The 3DS version will also be on the iOS
Because the iPhone, iPad, and iPod Touch are gaining ground as gaming devices, and the console version would be too big, so the 3DS version will come here then.

This game will lob some Take Thats at critics.
Especially IGN, probably referencing the "ignorance without IGN" meme.
 * Jossed.

Fang will be a boss

 * Maybe more likely in the 3DS version. Fang's been in more portable games than console ones.

The Mysterious Enemy is actually

 * Jossed.

The Death Egg will return
Dr. Eggman, while looking for materials with Cubot and Orbot to build a brand new robot, suddenly finds the charred ruins of the Death Egg in a volcano. Taking advantage of the fact that Sonic is already dealing with someone else, he proceeds to rebuild the Death Egg to not only lure Sonic into fighting him, but also to dispose of the new villain so he can fight Sonic one more time.

Eggman and Robotnik (classic Eggman) will team up.
Hey it's the perfect parallel to both Sonics teaming up.

Seaside Hill will be somewhat Under the Sea.

 * Since it's extremely similar to Green Hill, the dev team's going to mix things up a bit. Think of Seaside Hill being a remix of Aquatic Ruin instead of Green Hill.
 * Plus, the demo was hacked and contained the infamous Drowning theme, so one can assume that it will be used for that stage and/or Chemical Plant.
 * Further guessing that Modern Sonic's Seaside Hill will feature "Running On Water" segments, like Holoska, Adabat, Chun-Nan, and Aquarium Park.
 * Confirmed.

It won't just be classic level themes that get remixed

 * The bosses will have new remixes too (Duh), but not necessarily of the original songs that played in the battle - For example,.
 * It's a half-and-half sort of deal. Metal Sonic (the CD version) uses a remix of the JPN Stardust Speedway ~ Bad Future BGM for his boss fight, while a recent video shows an event featuring what is presumably a race between Classic Sonic and Modern Knuckles set to a remix of "Super Sonic Racing" by Cash Cash.
 * In the end, boss fights have remixed versions of the music from that fight. So, Jossed.

More guides will be available.

 * Tikal and Chip are the most likely, but Shahra and Caliburn could also work, and possibly even the lesser-known ones like Lumina. They could make them unlockable, one level only, or DLC.
 * Jossed. Chip only appears in archival Unleashed footage during the credits, Shahra is mentioned but not by name, and the rest is unaccounted for.

There will be a demo for Modern Sonic later on.

 * When downloading the Classic Green Hill demo, it is labeled "Sonic Generations Green Hill Zone Demo #1". This means that the game may have more than one demo before the official release, and the next demo will most likely involve Modern Sonic's version of Green Hill Zone.
 * If not Green Hill, it may instead be a different stage, from either the Dreamcast era or the Modern era, in order to match the the stage up with Modern Sonic, similar to how Classic Sonic was matched up with a Classic era stage in the first demo.
 * Confirmed by SEGA France. Check your PSN/XBOX LIVE on the 19th October folks!

Tombstones of deceased characters will appear
Possibly at Big's funeral, or in a Werehog level, or Crisis City.
 * Jossed.

The 2011 Macy's Thanksgiving Day Parade will promote this game
They will reuse the Sonic balloon from 1993 (complete with this song) to represent Classic Sonic.
 * Jossed. But a remake of the 1993 balloon seems likely, or a Modern Sonic balloon.

The Death Egg will be a sort of Marathon Level.

 * Both Sonics will have a short act inside the Death Egg, followed by a Boss Rush.
 * Jossed.

Why Shadow and Silver are bosses
They are working for the Time Eater. They wanted to defeat Sonic really badly. They made an alliance with him. However, since he has (or is one of the) Friends on the Other Side, those deals gave Shadow and Silver some drawbacks, those being One-Winged Angel modes amongst others.


 * Shadow: His arms become guns.
 * Silver: Blaze and Eggman Nega's head pop out of his chest.
 * Jossed.
 * Or it could be that Modern and Classic Sonic travel back to the points in time where Shadow and Silver were Sonic's enemies before having their respective Heel Face Turn.
 * Actually, Shadow is middle of Sonic Adventure 2 and Silver thinks it's a fake Sonic.

The time eater is a zombified Tikal and/or Maria
They (and Beta) are the only dead charcters from the main series that have not been revived yet.
 * Well, Tikal isn't technically dead, just trapped in the Master Emerald for all eternity, keeping Chaos company. Maria's a possibility, but highly unlikely unless she was also corrupted, as she's a genuinely kind person. Still, there's always a possibility for almost anything being a final boss.
 * Well, Tikal isn't technically dead, just trapped in the Master Emerald for all eternity, keeping Chaos company. Maria's a possibility, but highly unlikely unless she was also corrupted, as she's a genuinely kind person. Still, there's always a possibility for almost anything being a final boss.

Stardust Speedway, if indeed part of Metal Sonic's boss battle, will feature a remix from both of Sonic CD's soundtracks.

 * Both the Japanese and American soundtracks are amazing, so why not remix both?
 * It's a remix of the Japanese version of the Zone's Bad Future music,
 * In other words,.

The Red Rings will unlock bonus stages.

 * Colors added levels to Game Land, but Generations may run with the idea... add levels from other past Sonic games as optional bonus levels. It's odd that Sonic 3 and Sonic & Knuckles appear as separate games in the 20th anniversary video. CD and Secret Rings are even mentioned.
 * Jossed. They only unlock additional skills.

The Time Eater will act as both an allegory and a Take That to the Sonic fanbase.

 * The Time Eater will act as a Knight Templar that wants to "save" Sonic and Co. by erasing them from history.
 * Either before, during, or after the final boss fight, the Time Eater will probably make some speech about this being Sonic's only "salvation", and Modern Sonic will counter it with a Shut UP, Hannibal speech about how he's wrong prior to defeating him, serving as a Take That to Sonic's Broken Base.
 * Jossed.

Sega chose Crisis City as a stage for Ascended Memes.

 * If Flame Core was chosen to represent Sonic: Now Loading, the stage themes would have been a bit more diversified, and the game would have been just as paradox-y. However, Sonic never said "That tornado's carrying a car!" in Flame Core, and Shadow never said "Yes, but that alone is insufficient!" there.

Time Eater is actually Eggman's latest creation.

 * Eggman made it, and sent it back in time to change time in his favor. Time Eater mucking up the past leads to the Time Holes opening up.

The game will end on a riff on Eggman's Evil Is Not a Toy habit.

 * The Time Eater will turn against the Eggmen, but they manage to destroy it before things get worse, with Modern Eggman having a "As if I'm going through that again" attitude. Alternatively, if they fail, Modern Eggman turns to Classic Eggman and tells him, "Trust me, get used to this in the future."
 * Jossed.

The PC version will consist of NOTHING but Game Gear levels.
They're ommitted from PlayStation 3/360 and 3DS, so why not.
 * Or even better...
 * Jossed. The PC version is the same as the 360/PS3 versions.

NO Game Gear Levels will be included.
OH PLEASE, MAKE IT CANON! GAMEGEAR SONIC GAMES STINK!
 * Looks like someone never played or heard of Sonic Chaos and Sonic Triple Trouble.
 * And you're right... I think some levels will be in and improved, so I'm saying this is Jossed allready.
 * Confirmed.

The Time Eater is actully Coconuts and his evil army of sewer creatures he befriended being his mooks.

 * Feeling rejected by Dr. Robotnik, he seeks help from his only true friends, sewer creatures. Coconuts snuck down chemicals that'll help them be smarter and do things humans do. He them proceeded to trap Robotnik, Scratch, and Grounder, and procedded to be the next evil dicatator. The reason he could time travel is revealed that he accidently made himself a Time Lord from a chemical explosion gone wrong. The said explosion also made time stones and is the sorce of Coconut's TARDIS. He than decided to stop Sonic once and for all. He than became the monkey behind the chair, never being seen by his employees he hired by sending his Mooks to them. Problem is, he has to make holes to send them back, so he made the time holes.
 * Jossed.

This game will start a gaming meme with characters teaming up with their past selves.
Mario and Luigi Partners In Time started it, and this game will continue the tradiction.

This game will feature a Take That to people still in the gaming war of Sega and Nintendo.
A end of a level will feature Modern Sonic talking about Mario, or the man with the blue overalls and a mustache being slow on the ground, however being quite a good jumper, and saying after the adventures he has to go to the Olympics with him...
 * Jossed.

"Back in Time" will be remixed, and serve as a credits theme.

 * Sonic R and the Sega Saturn really wasn't a highlight for Sonic's history, but something from the Saturn era should appear. What better than something from Sonic R's cheesy awesome soundtrack.
 * Alright, I'll admit it, a modern, more rock-oriented remix of that song playing during the credits would be... mildly awesome.
 * Jossed.
 * There is, however, Sonic R content in the form of an unlockable "Super Sonic Racing" remix that turns up for some missions (in both version, no less).

Green Hill Zone will take place at sunset towards the end...
And the music for those last few levels will pitch up to the key of Sunset Hill. This is a good way to sneak a reference to the handheld games without actually using their levels.
 * Semi-confirmed. One mission takes place at sunset.

To go along with its theme, the finished game will have two different "Level Clear" themes

 * Modern Sonic will use the one heard in Sonic 3 onwards while Classic Sonic will have the one used in Sonic 1 and 2. I think that'd be brilliant at least.
 * Jossed. They both use the one from 3, or rather a remix of the Adventure and Adventure 2 versions.

Classic Crisis City will have the skateboard power-up like City Escape.

 * There was a boarding section in the original level, so it makes sense. Likewise, Modern Crisis City will start with boarding.

Silver will pull off a Big Damn Heroes moment
This is, of course, after a boss fight against him, where he remarks that Sonic looks familiar, in a shout out to 06. Because after all, Silver has proven that he will even travel through time in order to save people, not much of a stretch to see him repaying his debt to the Sonic's by saving time itself.
 * Confirmed. He appears to cheer on Sonic at the end.

Shadow is on the wanted poster on 3DS, whereas Fang is a boss
Just to contrast with the home console version, and for humor value.
 * Jossed.

Time Eater's personality will be a blend of traits from past antagonists.

 * Take Eggman and Nega, add a dash of Black Doom, and maybe a sprinkle of Mephiles. Then take Fang, add in Metal Sonic, and maybe a drop Chaos. Finally, take Erazor Djinn and King Arthur to top off a villain who covers the entire series.
 * But is the actual Big Bad from, not.
 * And maybe for humor, Time Eater will be a total Motor Mouth just like Cubot. And also a Deadpan Snarker like Orbot.
 * Jossed.

The Time Eater is the personification of the Unpleasable Fanbase.
Because what else would want to go after Sonic like this?

Crisis City was chosen because it's the biggest spectacle.
It's going to resemble the Los Angeles destruction scene in 2012, with Sonic running through collapsing buildings and outrunning crumbling highways. The fiery tornado will also become a Quick Step sequence and have buzz saws.
 * Maybe for an Ascended Meme, the tornado will carry the GUN Truck. Cue Sonic to say "That Tornado's carrying a truck!"
 * Jossed.

== Time Eater is deliberately placing Sonic into these points in time. == They are the moments with the greatest amount of conflict and thus danger for Sonic. I think it's no coincidence that every place except Green Hill seems to be at a time and place where something is going after Sonic or the area overall is highly dangerous for him. Green Hill is just there because Time Eater brought him there by accident; from that point onward, it tries to kill Sonic by putting him in a place where he could die easily.

To elaborate:
 * Chemical Plant: The factory is suffering a meltdown. Everything is exploding around Sonic, and the Mega Mack will flood the factory and possibly the city soon.
 * Stardust Speedway: Metal Sonic is there, who has proven to travel faster than Sonic.
 * Sky Sanctuary: The Death Egg, a superweapon, has launched and is gearing up to attack Earth.
 * Speed Highway: Station Square's entire police force is trying to catch Sonic.
 * City Escape: This is during when the G.U.N. Truck is rampaging about the city. There may be more than one.
 * The ARK: Shadow, the one guy to be truly Sonic's equal, still hates Sonic at this point.
 * Seaside Hill: The traps, especially the giant wheels, have been set on overdrive and the water currents have gone wild.
 * Station Square: Perfect Chaos has destroyed the city and can take full advantage of Sonic's Super Drowning Skills.
 * Crisis City: The entire world is collapsing around Sonic.
 * Silver's Arena (wherever it might be): Proven to be a Game Breaker in his debut game with his telekinetic infinites. In-story, he kicked Sonic's ass twice, and would have killed him if not interrupted by Amy and Shadow.
 * Rooftop Run: Eggman seems to be attempting to take it over with his forces.
 * Eggmanland: Eggman trying to kill Sonic while approaching the center of the Earth.
 * Planet Wisp: The entire planet is undergoing rapid "terraforming" and its inhabitants' life force being drained.


 * This doesn't work so well in the 3DS version, unless the Time Eater is sending Sonic to Casino Night to try to give him a crippling addiction to gambling or something...

The final enemy is
Modern Robotnik contacts them and they planned the entire ordeal together, orchestrating the game and jointly serving as the Time Eater. And then Modern Robotnik is used and tossed aside as usual, because so many modern Sonic games have that happen.
 * Even better yet, he uses the Time Stones to travel around the time stream.
 * Even better yet, he uses the Time Stones to travel around the time stream.

Considering Archie is getting in on this in comic form, Sonic Generations will involve Scourge/Anti-Sonic.
All hail the king, baby.
 * Jossed.

Classic Sonic is why G.U.N. upgraded their truck.
Ever notice why the truck doesn't use its sawblades or rocket boosters when chasing Classic Sonic? Since it's possible that all Act 1 stages have Classic Sonic playable, and after a humiliation from trashing their truck so much and collapsing by, they upgrade the truck before Modern Sonic's stage is played.

Sonic may bump into Axl Low at one point
Both are a victim of involuntary time travel problems of some sort. After seeing Sonic in action, Axl's inspired to try something similar to get his problem under control.
 * Jossed.

One of the DLC levels will be...
...Sonic 2's beta Hidden Palace level, just so Sega can finally use it. They could also try their hand at redoing Wood Zone.

The Time Eater is some sort of Wisp.
Just look at him! He resembles the Nega Wisp Armor. Not to mention the Wisps are (probably) the only type of gameplay that appears in Generations that was exclusive to a game instead of an era of Sonic.

The game will reveal the next Sonic
Age 19-22 Taller with a more realistic runners build, and with a new gameplay style. He'll be there to Troll the fans.
 * Jossed.

Modern Tails will act as a babysitter of sorts to Classic Sonic and Tails
Or 'try' to at least. It would be funny to see Sonic just ignoring him and Classic Tails being torn between himself and his best friend.
 * Jossed.

The fact that Modern Sonic, Tails, and possibly Knuckles and Eggman understand Classic Sonic will be brought up

 * Assuming they can (they haven't forgotten), they will also tell Classic Tails to stop translating for them.
 * Alternatively, M. Sonic could have forgotten sign, leading to a hilarious sequence between him and his incredulous past self until they find C. Tails.
 * Jossed.

There will be a Sonic Sez somewhere in the game
Most likely dealing with the Unpleasable Fanbase and telling them to stop being such jerks.
 * Jossed.

At some point, Modern will become so accustomed to Classic's non-verbal communication that he'll momentarily lapse back into the same habit himself.
Leading to Classic and Modern having a short conversation entirely in mime. Once Modern realizes his mistake, he'll refuse to tell the others what was "said".
 * This will culminate in a CMOA just before the final boss fight.

The reason Omochao can keep up with Sonic is that the image of him is just in Sonic's head: in reality, he is using a walkie-talkie/mobile phone/whatever
No other game has shown Omochao to be that fast.

Time Eater represents the Fan Dumb
It won't surprise me that the main villain is a Take That to the Fan Dumb.
 * Jossed.

The Time Eater is

 * He was angered that he never got to be in the same spotlight as Sonic, and years after his game fell into obscurity, he somehow found all of the Chaos Emeralds and performed a One-Winged Angel with them in an attempt to rewrite history to make him a star in the same light as Sonic.

The Time Eater is somehow related to the Hyper-go-on energy.
As we've already seen in Colors, that is some pretty powerful stuff right there if it can create a black hole by accident. Unused voice clips even state that Hyper-go-on energy is more powerful than the Chaos Emeralds. Who knows what else it can do, especially in particularly large quantities. For all we know, Eggman could have inadvertently knocked down a domino when his Mind Control Cannon malfunctioned, eventually leading to a Negative Space Wedgie-esque Eldritch Abomination -- the Time Eater.

Classic Sonic will have a crush on Modern Amy
There's nothing really special about Classic Amy as far as Classic Sonic thinks. But upon seeing the older and prettier Modern Amy, Classic Sonic will be smitten by her. Modern Amy, however, will see CS nothing more as a cute little kid and still has her eye on Modern Sonic. Hilarity ensues.
 * Thankfully Jossed, but he has a crush on Blaze (talk to her as him ).
 * Not really.

Sonic '06 still didn't happen
Crisis City is the only remnant of it that we see, and through the power of Fridge Horror, it could be said that it's actually a city on the edge of one of the continents that get pulled up off the earth in Unleashed. The monsters of Iblis are more manifestations of Dark Gaia, and Silver is still angry at Sonic because, well, he helped cause it.
 * This or possibly, Crisis City in this timeline is the result of Blaze's powers going out of control, causing her to believe her powers to be a curse and grow more distant from people (until Sonic Rush came along). This would also explain why she makes a comment about 'being back in Crisis City'. It's a painful remnant of her past. Blaze's powers are connected to Iblis still, so the monsters still appear there. Silver remains her friend all the same and only has second-hand knowledge of Sonic so, given that dopplegangers exist in the area, he's justifiably worried that the Sonic he's talking to is a fake and so,doesn't want to hand out the Chaos Emerald he guards so easily, since it might mean the real Sonic might not be able to get to it. I hope this theory works.

The Time Eater temporarily killed Mario. Twice.
Only nine periods/games in Sonic's timeline were (barely) remaining when the Time Eater attacked. Alas, the Mario and Sonic At The Olympic Games series is not among the nine, meaning that the Mushroom Kingdom briefly became a blank nothingness in 2007 and 2009, years not covered by Generations, by virtue of Sonic's interaction with that realm during those two years (The London Olympic Games is not accounted for, because it is being release after Generations.)

Classic Eggman became the Duke of Solenna...
Who was cloned into King Maxamillian Acorn.
 * Jossed.
 * Where?

The Final Boss from Sonic CD will appear in the 3DS version.
...And after it is "defeated", Dr. Eggman will not accept defeat so easily.
 * Jossed.

This game was originally going to be much darker.
This has been in development since 2008, right? And it must have been in pre-production even longer. Back then, Sonic games had very dark plots.

Sonic is now 16 years old

 * Since he's never had a birthday in the game before, this one might stick.
 * Considering how 16th birthdays in fiction tend to go, that actually seems reasonable enough.

The events of Generations created another timeline.
Let's look at the facts. Classic Sonic (taken from before/during the events of the first game) has visited locales that he won't traverse until later periods of time, many of these adventures taking place years down the line from Sonic 1. He At the end of the game, , but the prospect of a Stable Time Loop seems nigh-impossible, mainly due to the fact that  Now, whether or not Sega will capitalize on this possible Sequel Hook remains to be seen...
 * The possible sequel of this? A bad present where Eggman (or should I say Robotnik?) has become far more successful, and managed to conquer a good portion of the planet. It's up to Sonic and co to fix the timeline, by preventing the Time Eater's creation. For bonus points, the alterations to the timeline could bring long forgotten characters back into the spotlight.
 * It's also possible that Classic Sonic is set not long before Sonic Adventure, as . Notice that Sonic is rarely surprised when he goes to a new place. None of the areas he visited in the home console versions has him reacting in a way that would indicate he's never seen the places before in their own games from Speed Highway and onwards -- it is entirely possible that when he does reach those places later in life, he's already aware of what they're like. (Crisis City being an exception, but the events of Sonic 2006 were erased out of existence anyway and thus Sonic would no longer recall it.)
 * It's worth noting that, in the 3DS version, Modern Sonic teaches Classic Sonic the homing attack.

Sonic can manipulate vectors.
I mean, how else can he boost while grinding, or while on a board, or boost mid-air? His Homing Attack also completely makes no sense. In some games, he can even manipulate wind to a limited extent. But if we add vector manipulation into the formula, it all starts to click together.
 * Shouldn't this WMG go to the main series' page?

Classic Sonic & Tails are from 'just' before Sonic 2
Green Hill is becoming Emerald Hill (the corkscrews), although I admit that this depends on a Word of God statement that I can barely remember. Sonic knows Tails and Metal Sonic after the events of CD (following my 'other' WMG that CD is just being reminisced by Sonic in the Ep.4 trailers). I had some other arguments but I forgot.

WMGs, and using some stuff I've read over the years. It explains Given the lack of story in this game, you 'could' argue that the plot of Unleashed and Colours were never brought up (or the Moderns realized that this would cause a timeloop and kept quiet), and you could 'possibly' just Handwave . Or just wait until I can remember where I intended to go with this. Being ill sucks.
 * You could also argue that.
 * This leads right into...

.
 * If

This game explains why the Wisps are so trusting back in Sonic Colors

 * Given that the tractor beam is still active, we can assume that Planet Wisp here takes place before it does in Colors. Here, the two Sonics basically barge in, grab the Wisps, and total the place, letting the Wisps know that the Blue Blur is a friend. So, on the same planet back in Colors, they swarm around Tails and Sonic as if to ask: "Where did you go?!". This also extends to any other example of Sonic using the Wisps, especially the Cyan Wisp back in Tropical Resort, who knows that Sonic can use Hyper-go-on, although Sonic himself doesn't.
 * Strange, isn't it?

Rooftop Run will become Modern Sonic's equivalent of Green Hill Zone

 * Let's see: The music is nothing short of heavenly? Check. Appeared in more than one game, and declared one of, if not THE Best Level Ever in each? Check. Given the Unpleasable Fanbase, we'll probably only see hints of this level in future games, but, I swear to God, if Senoue makes a better remix than the ones in Generations...

Classic Sonic was added at the last minute
Thus, why his stages are more like a generic platformer.
 * ...what?
 * Wasn't this confirmed early on (except the 'last minute' bit)? Classic was just supposed to be in the teaser.

Silver's now living in the present time!
From what I can tell, and this is a theory, since Silver may have probably reappeared in Sonic's timeline and not back in his timeline (and assuming from the Console/PC versions that it's before remeeting present Blaze), Silver went through a Cosmic Retcon where despite him living in a former bleak future, he now lives in the present timeline, hence why not only would he be living in Blaze's dimension, but also appear in future Sonic games like Sonic Free Riders and Mario & Sonic at the Olympics. But this is just a theory.

Sonic just weakens for the Sonic of that time

 * It explains why he doesn't go super (other than Took a Level In Badass) and why . Sonic just knocked him down long enough to stop him blowing up the planet before . This also works for, but with Shadow (note the absence of the zero gravity trick).
 * Hilarious in Hindsight, as the first instance completely deconstructs The Power of Friendship if you go with the theory that Sonic is also weakening the bosses he fights.
 * It's not a complete deconstruction; Sonic still needed The Power of Friendship to turn Super and to snap Chaos out of his Unstoppable Rage.

The Time Eater was actually created by the black hole in Colors
We alread know the hyper-go-on Energy can do some pretty insane shit, first of all. It was revealed that Eggman found it right after the events in Colors, and the Time Eater does look... dark... black... you know what I mean.
 * It would certainly explain why the various worlds weren't completely undone. Cuz you know, a black hole popping up tends to do that otherwise...

Spagonia's Festival celebrates their death sentence policy
Funded 100 years before Time Eater messes up Time/Space, Spagonia had decided that all crime would be punishable with death, which is why they celebrate by putting arbitrary guillotines in the city.

The Time Eater was part of Robotnik/Eggman's Xanatos Gambit.
And that gambit? Fix the mistakes of the past! Even at the end, Robotnik and Eggman are still together, meaning that Robotnik escaped. Either before they worked on or after the Sonics defeated him, Eggman revealed to Robotnik his future, and where he will/had gone wrong. Warning him about that pesky echidna, that he'll need to keep ancient evils in control, his own creations in check, and that his grandfather will screw things up. With this knowledge, Robotnik will be prepared and win his battles.

Now why did he bother with the Time Eater at all? He theorised that talking about it would simply create an Alternate Timeline. Eggman wanted his history to change, not simply have another Robotnik. The Time Eater is an Eldritch Abomination who can control alternate timelines, so it could probably make sure the main timeline changes. Still, if that fails, at least he'll have some level of victory. Perhaps, one day, that Robotnik could travel to the main timeline and help him take over! It would go over much better than with Eggman Nega, since Robotnik would've been sucsessful/not be a Complete Monster. Yes, I know this makes Eggman a Magnificent Bastard. It's only fitting that he gets to be one, showing how far he emerges out of his Villain Decay

Classic Sonic sounds exactly like Steve Urkel.
He doesn't talk because he's embarrassed about it.

Mighty and Ray are dead.
Missing for over ten years? Yep, they're gone.
 * This troper is willing to bet that Bark, Bean, and Nack have something to do with their deaths. What exactly are they wanted for...?

Alternatively, they were taken by the Time Eater.
The Time Eater took all the games, remember?
 * Wouldn't that mean they've been frozen and floating in that limbo Tails mentioned for almost two decades?

The Time Eater was originally an angry Sonic fanboy.
The sheer depths of his Fan Dumb became too much for his reality to handle, and he started undoing time and space in a fit of rage. Eggman happened upon him after his last failure, and promised him to make everything in the Sonic franchise right if he worked for him.

The hub world is actually the first ever screen in Sonic games.
Y'know, where the Sega logo appeared against a blank white background.