You have at most one hand free. Best use of it is touching the screen, not waving it in the air. Imagine using your iphone by putting it on the desk and waving your hands at it.
With p0rn being one of the most used aspects of the internet, Jobs must feel something that leaves one hand free will sell like popcorn. And now you know what the lead-in story meant when it said: ...another source told Bilton, "You will be very surprised how you interact with the new tablet."