I took a nap when I got home from work (leaving Win10 running) and awoke to find the new log on screen.
Start menu transparent in full screen mode, but not desktop. I wish you could drag and resize it in desktop mode, it's too short.
I checked for updates. Yeah, build 10041 just a few hour out and there is a System Hardware Update.
It says "SELFHOST: CLICKING RESTART NOW MAY TAKE 5-10 MINUTES TO RESTART". Sounds like a firmware update, I hope it doesn't screw thinks up.
Edit: No, not a firmware, just an update which failed!