Utada Hikaru Will Not Sing For Kingdom Hearts III

[Benjisan]

This is disappointing news, i was looking forward to hearing Utada Hikaru's angelic voice on the next KH game

Hopefully, she will change her mind and sing for us, her devoted fans!

[Andromeda]

Kingdom Hearts III remains undetermined and the teaser at the end of KH2 and KH2+FM is not for KH3, but for Kingdom Hearts Birth by Sleep, which is dealing with a completely different cast of characters unrelated to Sora. We will not be seeing a KH3 this year or possibly even next year. In 2011 perhaps, but they are making spinoff KH games right now and not continuing the story of the main series. The only thing that makes the idea of a KH3 possible as a continuation, since KH2 pretty much wrapped up everything, is the very ending of the final FMV which has Mickey sending them a letter like there is something wrong.

If memory serves me Birth by Sleep is a PSP title while 358/2 is a DS title.

Also if I remember right, a good amount of the KH team is working on FF Versus XIII. So they are busy doing something else entirely. Unless Square is planning on putting different team on the game, its unlikely there will be a KH3 for a very long time.