Some intriguing possibilities:
- iPad pro has responsive stylus support (at least with pressure sensitivity) and a tiny gap between the pixels and he surface of the screen.
I think that alone would be huge for graphic artists and designers. Actually I think it would be pretty big for various kinds of creative professionals. It would turn an iPad into a more expressive and precise tool.
- iPad pro gains the ability to run full OS X apps. This is a lot further afield. They'd essentially have to make UIKit (the iOS touch-optimized UI API) available on OS X. I'd wish they'd also be able to come up with some kind of UI bridge that would let existing OS X apps work half-decently with a touch interface with only minor changes (seems unlikely -- the key is it needs to be decent or there's no point and I don't know if there could really be a general way to do that.)
Could be with significant RAM upgrades.