E3 may well be full of unexpected surprises, but one thing that's for sure is we'll see a new Kingdom Hearts game.
Series director Tetsuya Nomura was interviewed in the latest issue of Game Informer, and while he stopped short of saying that one of two KH games currently in development is Kingdom Hearts 3, he did say one of them would be revealed for the first time at E3, which begins on June 15.
We're about due for a third Kingdom Hearts game, but hey, this is Square! So don't get your hopes up. It could be Kingdom Hearts: Detente Excelsior 720/720 for the iPhone for all we know.