I don't even know how this would work, but Xbox Evolved says that the next Xbox (720 or Next, whatever) won't just be backward-compatible with games, it'll be forward-compatible. What the hell does that mean? Forward-compatibility would mean that games made for the 360 will be able to take full advantage of the next Xbox's muscle to look more amazing and like that generaation—not just cleaner textures and higher resolutions, but better frame rate, draw distance, the whole deal. Also, it would mean features in the 720's controller would be used in the game as well—in effect, yanking it forward a generation.