It may not be the Kingdom Hearts announcement fans were hoping for, but Famitsu reports that Kingdom Hearts HD 1.5 Remix is getting a release on Playstation 3. The game consists of the original Kingdom Hearts (Final Mix version), and an HD upgrade of Kingdom Hearts Re: Chain of Memories plus HD cutscenes from Kingdom Hearts: 358/2 Days.
Far from a complete compilation it suggests that a collection focused on Kingdom Hearts II and related portable titles could also be coming at some point. Hopefully these are then precursor for a long awaited Kingdom Hearts III.