Black Cauldron would be AMAZING. Imagine the Horned King and Maleficent combined. That would be pretty epic in my opinion :)
Tangled would be great, hopefully in KH3 they won't do too many worlds you've already been to before, like Atlantica in KH2 which had no story value at all and was filled with loop holes, like how Triton and Ariel know Sora and of his keyblade and other worlds, but yet Ariel doesn't know who Ursula is and Ursula not knowing who Sora is, and how on earth Ursula was revived.
That being said, it'd be nice if they perhaps go back to Lilo and Stitch's world as we never even saw Lilo in BBS. I don't know about Toy Story though, I'm one of the few who are sceptical about it, the same with any Pixar Film, I think KH should stay with the Disney Classics.
Jungle Book, Aristocats. Go to worlds of some of the other summons from KH1, Bambi or Dumbo. I'm more excited as to how they're going to set out the gameplay, will it be like KH BBS where you play as Terra, Ven and Aqua, and will it be Sora, Riku and Kairi, or will Roxas, Xion, Terra, Ven and Aqua be playable as well. ^_^