My current list of worlds for KH4:
Definite:
Star Wars - Obviously seen in the trailer. It’s in unless they have changed the game significantly to remove it since then.
Likely:
Toy Story - We know the version in KH3 is a copy. It could be revealed it was copied over from Unreality somehow. It’s such a successful franchise that it could be mandated into the game honestly.
Burton’s Alice in Wonderland - I believe Nomura mentioned wanting to include this world before? And I think we’ll have at least one live action remake film. This one is more of a sequel, but still.
Mary Poppins - I think this will replace the Hundred Acre Wood as our mini game world. We know it’s another Nomura has mentioned in the past. Just curious if they’d use Julie or Emily as the likeness for Mary?
Hopefuls:
Incredibles - This world has so much potential for bosses, team up attacks, etc. And I think it has enough realism to fit in well with other Unreality worlds.
Jungle Cruise - This one came out in 2021, so may have been too late depending where they were in world selection and development. But I have to include it as I used to work there and my life will literally be complete if it becomes a KH world.
Only thing is I’m not sure how interesting it would be for most of the world to just be a river though. But it does have the huge dock area, the native village, and the temple at the end that would be cool set pieces.
Thor Ragnarok: I think this is the perfect mostly self-contained MCU film to include. It has interesting settings and excellent potential for boss fights.
Coco: This one just fits perfectly with the themes we know of so far in the game and has an incredibly unique setting.
Longshots:
Atlantis: This world also fits well with the themes and would look amazing with more realistic environmental textures. It was planned for KH1, so we know Nomura is aware of it and could want to revisit it.
Treasure Planet - Same thing as Atlantis, previously cut world that has a lot of potential to fit into Unreality. It would be a good substitute for the Pirates of the Caribbean niche as well.
Haunted Mansion - Same reason as Jungle Cruise above as I worked there too.
I think this one is less likely though as the new film just came out last year and they probably wouldn’t have added the old one with the new movie releasing. However, I think it would be amazing if they actually did their own original take on the Mansion directly based on the attraction instead of a movie. Also, the Hitchhiking Ghosts would make an incredible summon.
Since we may only be getting 5-6 worlds this time, my preferred line up from these would be: Star Wars, Wonderland, Toy Story, Incredibles, Thor Ragnarok, and Atlantis.
For Jungle Cruise and Haunted Mansion, maybe instead they could be highly immersive attractions at a Disneyland-style theme park in Quadratum.