Paprika/WMG

Paprika doesn't abandon Tokita
She just forces her alter ego to act.
 * Does this even count as a guess? Not only is it entirely in Paprika's modus operandi as the 'unorthodox councillor' type, but she pretty much expresses as much after Chiba runs off after Tokita.
 * Physician heal thyself, indeed!

Chiba is pregnant by the end of the movie
Man +Woman + Paprika=Baby.

The dreamgirl Paprika represents sex.
Because she represents losing inhibitions, joy, freedom, and sensual enjoyment of life because of her appearance and personality.
 * This isn't really a guess, since Paprika explicitly spells it out at the end of the movie. (Man + Woman + Paprika = Baby.)

Paprika is the Defrosting Ice Queen scientist and Gentle Giant scientist's future child
Paprika's appearance is obviously informed by the Ice Queen's crush on the Gentle Giant scientist (reddish-brown hair, "bouncy" attitude, casual clothing, curves); hence their children will look like Paprika.
 * Or perhaps the Defrosting Ice Queen always secretly wanted the Gentle Giant's babies, and Paprika is a manifestation of that desire.

Paprika takes place in the same universe as Inception
The DC mini led to the creation of the Machine used in Inception, after the idea of using somebody to merge their dreams into others by  made the idea of an Architect. This would mean that  are now stuck in Limbo, likely forever.
 * Wasn't there  at the end of Paprika? The Japanese economy would have probably taken a major hit, thus hurting the chances of a Japanese energy mogul in Inception.
 * But isn't that just the sort of situation a clever buisnessman could capitalize on?

Paprika is Chiba without her "masks"
At the end of the film, Paprika asks Chiba whether Chiba is a part of Paprika instead of the other way around. Paprika represents the core personality of Chiba, the way Chiba would be if she didn't suppress parts of herself. All of us wear masks, we aren't the same person at work, at home, with friends, or with family. Parts of our personality get filtered out or hidden. Paprika represents the whole that exists if we didn't filter ourselves.

The dreaming never
The devices created some sort of burst effect that  at the same time. They all dreamt reality, at least to start with, and the movie ends with everyone still unconscious. This does mean that  is an NPC, only there because someone else expects them to be there, if they even still exist, and that if   doesn't collectively wake up, they have a few days (at most) to live.

Satoshi Kon knew that he was dying and made 'Paprika' as his magnum opus.
The movie follows a few typical Kon styles (berating laziness and avoidance of responsibility, confusing imagery, violence), but breaks from some of the usual things he does, too. Despite being an avatar for a relaxed lifestyle relieved of responsibility, Paprika isn't seen as a villain. Chief Konakawa is told that just because he has a new dream, it doesn't mean that he's irresponsible or that he abandoned his friend. Films and film history are looked upon fondly, and are even explained at one point, probably a reminder of something he loved.
 * Indirectly Jossed. Paprika was released in 2006. Satoshi Kon was diagnosed with pancreatic cancer on May 18, 2010 and died on August 24th, 2010. His biggest regret was leaving The Dream Machine unfinished, which was his project at the time. It is currently in Development Hell.