Two small but handy additions:

 - 6 shortcuts in the notification shade (+ settings shortcut)
 - Reboot option in the power menu

I'm really excited for the reboot option. Can't believe it took Google over 6 years to implement this simple, and possibly the most requested feature...

Android 7.1.1 update on Nexus 6x

My update came in yesterday and installed without any problems. Everything that I've tried since has worked without problems. I do like the pop-up options that apppear after long-pressing app icons (mainly Google ones at the moment) and a Restart option on the power button. Looks good!