Besides the review score, Famitsu gave us some more insight in the differences between the PS3 and Xbox 360 version. Final Fantasy XIII will appear on one dual layer dvd, so the game is … huge (+25GB). The Xbox360 version will ship on multiple (3) discs and will have compressed audio and cut scenes.
Recently I’ve posted the Japanese full box art. Because I did this too quick, the image was apparently resized to a smaller size. Here’s the full box-art in its original quality. You can clearly see that the game will make use of full HD audio and video. The Xbox version will probably be compressed to 720p video quality.