So for me, when it comes to worlds in KH, I don't necessarily want Disney films that i really like. But rather movies that will be fun and interesting environments. I would also like to see the KH story tied more closely to whats happening in each Disney world, like in KHI. My world list my be a bit large, but i think it possible.
1. Alice in Wonderland (2010 Live action)
It seems Nomura like having at least one live action movie in most KH games. I think this would be a great fit. Its a little bit darker than most properties in the series and seeing how well it looks like the brought Pirates to life in KHIII this could be a really fun world to be in. Plus you could have the Mad Hatter with his claymore and Alice in her armor with the vorpal sword. You could even fight the Jabberwocky. I know we have already been to wonderland, but this would be an awesome return.
2. Tron: Legacy
So I really like this movie. I know its not great and i know we have already been to the Grid in KH
DD but this world deserves a Unreal Engine revisit. There are some many visually eye melting areas they could explore from the film. Going of the grid, the arena, the city, with the capabilities that they have now, this world could look amazing.
3. Treasure Planet
This not one of my favorite Disney animated films, but damn it make a cool world in Kingdom Hearts. There are some great characters and some really cool locations. You could get on a space ship and visit the multiple planets and locations from the film that would be a joy to run around killing heartless in.
4. Wall-E
This in one I want in the game because I love the movie. Having Eve in your party would be awesome. You could have some the main ship, the Axiom, be the main location, and even go to earth with all mountains of cube trash.
5. The Sword in the Stone
Being able to see Merlin in his own world and having him in your party would be awesome. That movie has some great villains and would be a blast to be in. You could also have Arthur in your Party.
6. The Emperor's New Groove.
The Inca Kingdom would just be a lot of fun to be in. Having Lama Kuzco and Pacha in your Party would be great. Kronk is great. Lots of locations that would make for some great gameplay.
7. Coco
What a gorgeous film. There are so many ways they could approach this and mix it with the world of Kingdom Hearts. Sora and gang could even be turned into skeletons with Donald's magic.
8. Moana
If having Moana and Maui in your party isn't enough, You have some great places to fight heartless and adventure through.
9. Robin Hood (1973, Animated)
This maybe a bit to similar in setting to the Sword in the Stone, but its one of may favorite Disney films. Plus you could have Sora as an anthropomorphic lion. This would be a cool call back to one of Sora's original designs. Plus have Robin Hood and Little John on your Party would be very nice.
10. Atlantis: The Lost Empire
When KHIII was announced, this was the first movie that i thought of. It has some of the most breathe taking visuals and designs. There are some many characters that would make this an awesome world to include. Have Princess Kida in your party would be awesome.
--Original Worlds--
I was thinking it would be cool if the main or tutorial world was the mainland of Destiny Island. We have only seen bits of it and i think it would be Pretty cool. You could even take a raft to destiny island.
--Other Stuff I thought would be interesting
These are just a few things that I think could be implemented to make Kingdom Hearts grow as a game.
NO GUMMIE SHIPS
Im sure a lot of people love the gummie ships and are glad they making a return in KHIII, but i think we can move past this now. Im sure it eats up a lot of development time, time that could be spent on giving us more worlds to explore.
KEYBLADE ARMOR
I was really hoping Sora would get Armor in KHIII, but it doesn't look like thats gonna happen. This could be a nice addition to Sora's abilities. It could work similarly to a Drive From from KHII. Build up a gauge, activate the armor. You could even level it up and as you level it up it changes in appearance.
OUTFITS
Ive kinda wanted this in a Kingdom Hearts game for a while. Sora could obtain new outfits from bosses, enemies and even allies. like a outfit inspired buy a samurai nobody. Or one similar to what Vanitas wears. These outfits wouldn't be just cosmetic either, they could provide stat boosts as well.
DUNGEONS
This is a big one. Something that Kingdom Hearts could expand on is end game content. Dungeons could be a great addition. Im talking full on Zelda size dungeons with puzzles and everything. These dungeons could contain powerful new enemies and new variants of enemies. Kinda like what KHUX did with heartless like the Defender or Large Body. Each dungeon could be unique to the world its tied to and have unique bosses at the end.
The dungeons could hidden and would require you to complete certain task to unlock them. Beating them would give you new and powerful accesoies, outfits and keyblades.
Thats pretty much all i got. I think I could go on and on thinking about what I would like to see in the next Kingdom Hearts game, But for right now, Im just excited to play KHIII.