At this year's Tokyo Game Show, Square Enix announced a high definition remake of the first Kingdom Hearts, Kingdom Hearts Re: Chain of Memories, and Kingdom Hearts 358/2 Days. It's called Kingdom Hearts HD 1.5 ReMIX.
In the upcoming leaked issue of Famitsu, Kingdom Hearts designer Tetsuya Nomura was apparently asked whether or not there would be a HD remake of Kingdom Hearts 2. "It would be unnatural if there wasn't one," he replied. Nomura, of course, didn't say if and when said remake would happen -- if it actually does happen.
Still, don't act too surprised when Square Enix announces the inevitable high definition remake of the 2005 PlayStation 2 classic. Act happy.