They revealed very slight details about the game after teasing us with Unchained. What they did say is that they are working closely with Disney and that Tangled will be the first world incorperated into the game:
Revealing the growing world of KINGDOM HEARTS, SQUARE ENIX® and Disney Interactive today showcased a new gameplay trailer featuring never before seen footage from KINGDOM HEARTS III.
Fans of the highly-anticipated title from the celebrated series from Disney Interactive and SQUARE ENIX will see Sora and his trusted friends, Donald Duck and Goofy, adventure through the world based on the hit animated feature film, Tangled. The trailer also gives new hints to the storyline and showcases gorgeous visuals, and new gameplay elements.
The world based on the film Tangled is one of many big reveals the team has in store and is the first announcement in a larger, deep creative collaboration between SQUARE ENIX® and The Walt Disney Animation Studios.
The game is stated as “in development” with no release time frame just yet. We will have more details soon. On the flip side, they did state Kingdom Hearts: Unchained X is heading west. The game is an iOS and Android title and will have story connections to Kingdom Hearts 3.
Opening up the world of KINGDOM HEARTS like never before, SQUARE ENIX® and Disney Interactive today announced KINGDOM HEARTS Unchained χ (read as Unchained “Key”), the first game in the KINGDOM HEARTS series to come to iOS and Android devices. It will be available as a free-to-play app (with in-app purchases) in North America.
In KINGDOM HEARTS Unchained χ, players will uncover story elements from the earliest parts of the series’ history, as well as from the highly-anticipated, upcoming KINGDOM HEARTS III. For the first time in the series history, players will create their very own Keyblade wielder and adventure through Disney worlds with beautiful and stylized art, while interacting with a rich cast of memorable Disney characters.
Customization takes center stage with a slew of features for players to fine tune their character. Players can collect, fuse, and evolve items to customize the attacks that their Keyblades can do, team up with other players in guilds to take down giant Heartless bosses, and much more. Combined with the new Avatar system and diverse outfit selection, this is the most personalized KINGDOM HEARTS experience yet.