Some reminders.
The World Ends With You characters were in KH3D which was awesome.
I am also predicting that we will see a Lilo and Stitch, Pirates of the Carribean, and Toy Story level in the game. Stitch's story in BbS obviously leads up to a Hawaii based level. Also in one of the trailers for KH3, Woody's Sherrif Badge is on one of the menus that sora activates in his Gun Wielding stance he used. There was also a Dark looking pirate motif on the menu bar when sora did some pirate shit Attack.
Lastly, though I don't know where the sources are for this, but I heard a couple rumors...
1. Utada Hikaru said that she doesn't want to do the theme song.
2. The guy in charge of KH (can't remember his name atm) asked Marvel and Lucas Arts if they could use their properties. He said "some said yes, some said no"
Also Mael. Spider-Man is a Sony property, sorry to kill your hype.
I also get the feeling that the final boss fight will involve us playing as Kairi. I am predicting this based off of how the last few games ended.