Donkey Kong 64/WMG

Mad Jack is still alive, just hiding.

Yes, he supposedly fell to his doom. But even though a crash is heard, you don't see his remains. Ever. My guess is he got up and made himself invisible, and is currently trying to find ways to strengthen himself for his inevitable second confrontation with Tiny. Possible new powers;

Total control of fire, rather then just throwing fireballs. He got zapped FIVE TIMES. Maybe he can control electricity via the charges in his body from the fight with him?

Also, his voice will be more akin to the crazy laugh from his battle music rather then Donald Duck. And he will be able to speak.

The Mysterious Pedistal Room would have been involved in Stop N Swop

The Rare Witch Project found the infamous Ice Key in the game, so that must be a part of it.

Lanky Kong is Manky Kong's brother.

Orangoutangs were once part of the Kong family. There used to be a whole clan of them, but they were killed by the kremlings. Only two brothers were left. One of the brothers, Manky Kong, turned traitor because he blamed Donkey Kong for letting the kremlings invade Donkey Kong Island, and for not doing enough to stop them. The other brother, Lanky Kong, on the other hand became deeply depressed, and masks his pain by dressing up like a clown and making other Kong family members laugh.

The Banana Fairy Queen made Tiny Kong grow older.

After Tiny Kong and her friends found and captured all of the scattered Banana Fairies in the game, the Banana Fairy Queen offered to grant Tiny Kong a wish as a reward. Tiny, who was secretly insecure about her tiny size, wished to become older and taller. Her wish was granted, and the other Kongs, though surprised at first, soon got used to the change.