I just had an idea. Summons are creatures that used to have a world, but then it was destroyed by the Heartless, then restored again after Sora defeats the heartless. Maybe this hints that when you get a summon, you can expect to go to their world in the next KH game. For example, three summons from KH1 had their worlds back in KH2. Simba in Pride Lands, Genie in Agrabah, and Mushu in Mulan. Maybe in the next KH game, we could expect to see the worlds of Chicken Little, Lilo and Stitch, Dumbo, Bambi, and then Neverland again.
*also this is off topic, but I think Atlantica should be replaced with Finding Nemo*
*also this is off topic, but I think Atlantica should be replaced with Finding Nemo*