At least at this point it's accurate to about a palm sized region, and there is a cool auto scroll demo. But getting together UI and making it useable is a pretty big project.
That's not great but it would be acceptable to switch focus between screens (or big enough tiles in a tiled desktop). Together with some clever mechanisms one could define task/tab/window groups per area and make switching much more manageable for large amounts of elements without having to surrender to "pick the mouse"-"select"-"back to the kb".