Considering how Nomura confirmed that only few of the old worlds are returning for KH3, here's what I think the world list would be; both old and new.
Old Returning Worlds:
Twilight Town.
Destiny Islands.
Radiant Garden(I seriously hope)
Olympus Coliseum(Mt. Olympus, which makes sense since we entered the stadium multiple times in most of the games and the Underworld in KH2)
Agrabah(I do hope Agrabah returns to complete the Aladdin trilogy in the KH games, since it's KH3 here)
Disney Castle(Maybe?)
New worlds:
Kingdom of Cornona(Tangled world)
San Frasokyo(Big Hero 6-weird but anyway)
The Lost Empire(Or simply Atlantis, either way, I hope this makes an appearence)
The New World(Pocahontas-most likely)
Empire of Kuzco(The Emperor's New Groove-Everyone pretty much wants this film in the KH games, right? Especially the humor parts)
The Black Cauldon(haven't seen the film, but it's still Disney, right?)
Treasure Planet(Not much of a fan of the film, but it's most likely)
Final battle grounds of the game(To replace the End of the Worlds, The World that Never Was and The Keyblade Graveyard)
Worlds that aren't likely to return:
Pride Lands(unless you want to count time travel)
Port Royal(Would be nice to have it return, but I doubt it)
Atlantica(Ariel's story is finished)
Traverse Town(How many times do we have to return here anyway?)
Land of the Dragons....
Okay, I say the rest of the worlds we've visited aren't likely to return, and I seriously hope Toy Story or any other Pixar films don't appear, and not Star Wars or Marvel either.
The only Pixar film I can agree on, however, is Brave.
here.
