Android 5.0.1 update is actually coming in OTA mode… An update so new features ?
Nope that’s just an incremental system update, you can guess it seeing the package size (only 13.3 MB) :
So bug fixes like battery drain (too rapid on certain devices), wifi issues and system stability improvement (some Nexus and other android devices crashed too much).
OTA (Over-The-Air) update is rolling in different phases so if you don’t have the notification yet, wait and be patient it will be there soon ;)