The classic action/RPG is getting an HD upgrade. Already out in Japan, the video above shows how really great it has improved.
The upcoming PS3 port includes a number of content pieces. Kingdom Hearts Final Mix is a special version of the original game yet to come to the States, and players also get Kingdom Hearts Re: Chain of Memories (the PS2 upgrade of the original GBA game). Finally, as an extra bonus, players get HD cinematics of Kingdom Hearts 358/2 Days.