Android 5.1 Factory Images Available for Nexus Devices (Updated: New Nexus 6 Build LMY47E)
Updated March 12: Nexus 6 factory images added.
The first batch of Android 5.1 factory images are now available for the Nexus 5, Nexus 10, and Nexus 7 (2012).
You will find links to all below. We will update this post as we have more.
Factory Images (Android 5.1, LMY47D):
Instructions for flashing factory images can be found here.