Well the autofocus is prob. extremely slow because the camera uses a different focusing procedure when the mirror is flipped up, it has to focus using "2d tracking" not the normal "3d tracking" and being newschoolers its mostly sports shooters so the slow autofocus is still not good.(wonder if af-s lenses would be a little faster?)
BUT, from the video from chase jarvis it looks like it has very very good video in low light.
and the 39 point autofocus system beats canon as usual like every other nikon camera.