It's on the KHIsinder home page.
http://www.khinsider.com. The last time I checked, it's the second news post. By the time you read this it may have changed though. The download is an 80 MB high definition version (and boy, does it look good enlarged! I love that new media player!

), but you can also get a low res version either streamed or downloaded, in Avi form. Youtube has a low res, KHInsider also has it streamed right in one of their news posts (You'd have to search for it probably. May not be directly on the main page. Probably in page two or three of the news.) It's good though.
The ps3 for KH: Final Mix.... I'm not too sure about that... First of all, it would take significantly longer to make that than it would the PS2 version, and second of all, a PS3 version of it would have to be rebuilt from the ground up. I think all their really doing is adding elements here and there (lots of them!

) Re:CoM though perhaps, if it were a standalone game. Since that is basically from the ground up, I can see that on the PS3 with more ease than KHII: Final Mix....