I hope they go for Utada too. I'm sure she's flooded with messages on her blog/twitter about doing it. But she is a fan, she might be willing to come out of hiatus for the sake of one song? I dunno, it might be asking a bit much to bring her back so I'm kind of preparing myself for them saying they've got someone else. If she does come back then great, couldn't be happier. But yeh, who can say.
Awesome news it's coming back, it's insane to think that it's been so long that a KH game hasn't even come out for the PS3. Crazy. Fan reaction vids to the trailer reveal are hilarious. Grown men screaming and crying. I can see why, KH has a big fanbase and you have to consider that people played these games in their childhood/formative years, so by showing that trailer and playing Simple and Clean over again, you're just tugging hard on that nostalgia. Also very exciting to think of the possible worlds in KH3, because Disney bought the rights to a lot of studios. Marvel and Star Wars are the two biggest ones, obviously, but don't forget they bought Pixar Studios too. Toy Story? Wall-E? Monsters Inc? The Incredibles? Up? Anyone of those would be a nice addition in some way.