Google posted Android 5.1.1 factory images today for the Nexus 9 LTE (LMY47X) and Nexus 5 (LMY48B), leaving the
Nexus 7 (2013) LTE, Nexus 7 (2012) mobile, Nexus 4, and Nexus 6 as the only current Nexus devices without them. I would imagine they will be here before long. Once they do show up, we’ll be sure to share them.
Update: Google just posted images for the Nexus 7 (2013) LTE, Nexus 7 (2012) mobile, and the Nexus 4 all as build LMY47V.
Instructions for flashing factory images can be found here.
You can grab the latest factory images from Google here.