I'm guessing it'll have a mixture of new and old worlds, and hopefully a few more original worlds.
New Disney Worlds
Pocahontas
Treasure Planet
Lilo & Stitch (in Hawaii this time)
Atlantis
Old Disney Worlds
Agrabah
Halloween Town
Olympus Colosseum (actually going into Thebes, Phil's Island, and Mount Olympus)
Atlantica (please, Nomura, just say no to musicals...)
Disney Castle
Yen Sid's Tower
Port Royale (Davy Jones and his heart were pretty much made for this series)
Original Worlds
Destiny Islands (The main island, hopefully)
Radiant Garden
Twilight Town (Got to go see Hayner, Pence, and Olette again! Also, there should be some obligatory ice cream consumption on clock towers with Lea)
Castle Oblivion (So they can go get Ven out of his coma)
(insert final epic world here)
That's 15 worlds. KH had 13, KHII had 16. I would like to see as many places as possible, but I purposefully left out Pixar-based places. While those movies would provide a plethora of new material, I'd like to see them go through the rest of the old animated movies first.