> Samsung may well have improved the "resolution" of the sensor so that it works. Or not.
The stylus works like a Wacom digitiser. It uses electromagnetic resonance technology patented by Wacom I believe. No need for power but pen tip power, orientation of the stylus, makes it better than any stylus system out there.
The only problem is that the API for the stylus is owned by Samsung and not a part of Android. Mind you, they could have just licensed Wacoms Cintiq.