Apparently you would use body motion, the very principle of Natal, to steer an on-screen avatar around tracks and to use power-ups on rivals.
"It all sounds very intuitive, but will it be fun?" remarks Joystiq, citing their source. You would 'reach out' to the screen to acquire weapons and then launch an attack on other racers by motioning toward them. Hopefully E3 will have this on show.
