it's the 10-15% of the CPU part that worries me, that is a significant chunk of proccessing power for just the input device and means that if the developer wants NATAL suport in a game they will have to tone down the complexity of the AI, physics or reduce the number of objects on screen at any point. That means that it's probably not going to be used in games that are not designed spacifically for NATAL, So ideas like having hand gestures in Halo Reach won't be happening unless Bungie can reduce the CPU requirements by using NATAL for just that specific task and will probably mean that 80% of the games that support NATAL will be mini game collections and Milo. and will probably mean that NATAL is doomed.
@TheVoxelman on twitter