With the updated lockscreen notifications in Android 5.0 Lollipop, Google has now also added a feature called Ambient display mode. This will allow the phone to light up the display when notifications arrive. Even better, it will wake the screen when you pick up the device, similar to the Moto X.
The feature was spotted in the Preview build of Lollipop and it was running fine on the Nexus 4. Hopefully, Google does NOT limit it to just the Nexus 6 or Nexus 9 (since it has an AMOLED display, which works better for these things) and brings it to all Nexus devices.
