Ollie King did use a skateboard, but the movements were basic, and could easily be replicated by Kinect. I remember just leaning forward, back and left and right. Momentum was automatic, as the game operated on a downhill track. So no silly Tony Hawk ride stuff.
A skateboard itself probably wouldn't be needed, just stand sideways and lean to the funky beats.
I'm totally cool with HotD4 being on PS3 only, but I am peeved that a lightgun has yet to release for 360. Yeah, theres the hunting game one, but they could easily use Kinect + a gun. All the tech is there, they just aren't making it happen.