Re: Nadella's support surprising
I agree about price. If we see additional ARM-based Surfaces, they'd better be cheaper than the ones that came before. If Microsoft decides to release a Surface Mini at the same price as an iPad Mini, for example, I don't see that working out. With the Pro devices, the price would be more justifiable if the keyboard were included.
As for Win 10, they still haven't shown us much regarding tablet/ mobile functionality, and most of the desktop stuff they've shown is about mice and keyboards, not touch. Will be interesting to see if Win 10 convinces those people you mentioned who are still trying to buy Win 7 PCs. I think the desktop UI in Win 10 looks promising, but it's still a long way until the new OS launches.