The screenshots, if actually legitimate, shows an earlier development build of the game running, so please excuse the poor presentation and screen clutter.
The world seems to take place in the Monsters Incorporated building from the first movie. This image shows the room where all the doors are kept. Also, there’s Boo in the bottom right of the screenshot.
A monster boss battle in the lobby of the Monsters Incorporated building.
Not sure as to what the X could be for…
Sora, Donald, and Goofy are decked out in monster skins to match the Monsters Inc. universe.
Earlier this year we got a first look at the Toy Story world coming to Kingdom Hearts III, so we know that Pixar properties are now possible in the Kingdom Hearts universe.
Kingdom Hearts III is scheduled to release in 2018 for PlayStation 4 and Xbox One.