The iPad Pro doesn't not have palm detection, as far as I know. This is kind of a deal breaker to port the app.
"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."