The full changelog for the upgrade can be seen below:
Android 6.0.1 (Marshmallow)
Exercise greater control over app permissions
Experience enhanced battery-life through Doze
Redesigned App Drawer
As you’d expect, this release is being distributed in stages. To see if it’s ready for your device, simply head into Settings, select About Device, tap on the heading entitled Software Update, then hit the Download Updates Manually button.