Apparantly at launch there will be 16 or 17 Natal games, about as many as there were for the Xbox 360 launch. Microsoft looks like they are investing far heavier into Natal and they can spread the cost over several platforms.
I saw a video posted of a TV with an Xbox 360 interface... imagine Xbox 360s bundled with millions of TVs every year?! That'd be pretty sick!
Edit: Sick as in unfair. Though it'd be funny to hear people complaining that the Xbox 360 is only doing well because its being bundled.