Well it would definitely be nice to have more serious applications for the iPad and perhaps some new mobile productivity apps crossing over to the Mac. But the

Well it would definitely be nice to have more serious applications for the iPad and perhaps some new mobile productivity apps crossing over to the Mac. But the UX is so fundamentally different that I'm afraid the majority of the applications will be pretty awful on the Mac as mobile is less information and feature dense while having a smaller screen. What could be really great is having feature dense UI's on the larger iPad Pro's since they do have the screen real-estate but often it's underused.