I haven't heard much news on USB 3.1 so far. I don't see why they're calling that thing a MacBook. It's thinner and lighter than the Air, but it's not the Air. I was anticipating a Retina Display Air since it's the last laptop that hasn't been converted yet......but they're still planning to sell it in addition to the 12" MacBook. Just wat. But yeah, it seems to be targeted towards the Chromebook market. I'm not sure how good its performance is since I don't know much about the "Broadwell" architecture. The graphite cooling system seems interesting though. I can't say I've heard any other computer use something like that.
I dunno about the keyboard either. Scissor keys on the current Retina MacBook Pro seem pretty solid to me. I still like its super silent operation over my MX Browns and it already does have a really short travel distance.
I don't see the great appeal for smartwatches either. I actually think all smartwatch interfaces look stupid to use; you're swiping on this tiny 1.5-inch display on your wrist, from maybe 1-2 feet away, with your arm in front of your face, as you’re walking or whatnot. Just wat. The Apple Watch's digital crown looks stupid to use too since the crown is basically right at your wrist. That would be the equivalent of trying to adjust a regular watch's time on the fly as you're moving around.