It has hardware palm rejection.

Can you give me a link? I tried searching around after seeing the demos, and it seems like they always have to hover their hands while writing.

I saw this today: http://www.macrumors.com/2015/10/06/disney-artists-ipad-pro-...

"In the Periscope, Ranjo was impressed with the grip of the iPad Pro's screen when used with the Pencil, and he also was a fan of the palm rejection features. When drawing on an iPad Pro, the palm of a hand can be rested on the screen, but it's still responsive to zoom gestures."