I wish that Kingdom Hearts III will start to introduce Final Fantasy worlds to go with the Disney and KH-original worlds. While I did like seeing some FF characters in certain worlds (Like Auron and Zack in Olympus Coliseum), I would like to see the characters not yet introduced in the series to appear in their own homeland. Out of the three I would love to see, it would have to be Ivalice (FFXII), Cocoon/Grand Pulse (FFXIII), and Gaia (FFIX)