Kingdom Hearts HD 2.5 Remix
Square Enix's Kingdom Hearts HD 2.5 Remix for PlayStation 3 contains Kingdom Hearts II Final Mix and Kingdom Hearts Birth By Sleep Final Mix, and you can compare the collection's HD upgrade in this interactive trailer.
The trailer contains a comparison of the HD vs. old SD visuals, as well as that same footage then repeated in HD and SD. You can also click on the HD, SD, and Compare buttons just under the annoying banner at the top of the video to switch among them.
Kingdom Hearts HD 2.5 Remix comes out on December 2 for $39.99, and also contains a collection of remastered and additional cutscenes from Kingdom Hearts Re:coded in a theater mode.
For more on the game, check out this previous trailer from E3 that also includes a tease for Kingdom Hearts III.