Thats so rad.
It's head-tracking which I was well aware is the one of the few "Non Glasses 3D" methods, but can't be what the 3DS is all about (Considering that game is on the DSi), if it's just more advanced head-tracking then I'm not ready to bite.
I'd get a DSi just to play that game, but now that they announced the 3DS, I have no reason to believe it won't have the camera on it as well (Unless they want to sell the DS, DSi, and 3DS at the same time which will be a pain in the ass.)
I'd be really happy if they just made the 3DS where you'd have to wear glasses for the 3D effect, since doing it this way so far is the best way to show 3D (Trust me, I have a 3D set up for my computer and it's balls to the wall).