Android Wear 2.0 (which I kinda care about since I've got my hobby project that runs on Wear):

- "Any watchface can show data from any app" -- this is going to be complicated. Apps provide "complications" that render inside a face.

- Oh boy, they've got a teeny tiny keyboard as well as handwriting recognition so you can reply to texts without needing to pull out your phone.

- Apps can (finally!) talk directly to the network, rather than needing an on-phone companion proxy app.