Nexus 6 owners on T-Mobile are now receiving their update to Android 5.1 Lollipop. The build number for the update — LMY47M — is actually different from builds we’ve seen rolling out previously, so hopefully nobody flashed those in an effort to get a jump on 5.1. The update weighs in at about 409MB and should hit your Nexus 6 any minute/day now.
Android 5.1 brings lots of smaller tweaks to Lollipop, with new “anti-theft” security features that prevent unauthorized use after a factory reset, new quick toggles, animations, a heap ton of bug fixes and VoLTE (WiFi calling is expected in a later update). If you haven’t received a prompt yet, you can manually check for the update by heading to Settings > About phone > System Updates > Check now. Good luck!
[T-Mobile]