Tetsuya Nomura said the worlds will be entirely new but three of the confirmed worlds like Pranksters Paradise, The Three Musketeers, and supposedly Tron Legacy have all been in Kingdom Hearts in some way or form.

 

Prankster's Paradise: Pinocchio was already in Kingdom Hearts and the world he was in was Monstro. Technically Nomura is bending the rules because there has already been a Pinocchio-based world along with characters from Pinocchio.

 

The Three Musketeers: This world is supposed to have Mickey, Donald, and Goofy in it so it's basically just Disney Castle/Town in another time line right?

 

Tron Legacy: Tron has already been in this game but hasn't been officially confirmed yet.

 

I've thought of some plot holes with some of these new worlds. I hope a Pixar based world is confirmed that way I won't have anything to say about it.

I think that it was only a matter of time until Nomura started to cheat a bit with this game. I mean "all new worlds" is a little tough. A Tron: legacy world I was expecting as well. If you look at KH and KH2 almost all the worlds in KH had a follow up in KH2. In this way I wouldn't be surprised if he tried to slip a version of another already-used Disney world.

My theory of what Nomura said in that interview:

The interviewer didn't let Nomura finish his sentence. What Nomura's full quote was, "KH3D features all brand new worlds, but not all of them will be based on things that we haven't done yet."

 

Nomura, you troll.