A small fixer is expected to arrive to handsets running the recent Android 5.1 update. Developers checking the SDK Manager will find a revised Platform SDK with a description called “Android SDK Platform 5.1.1.”
That fact that this Android version is up their means the code is finalized and Google is undergoing tests. The official ASOP hasn’t been updated yet, but we should be seeing this change very soon. Some Nexus devices still haven’t received the Android 5.1 update, so it’s possible Google may push 5.1.1 to those devices instead.
Has your device received Android 5.1?
via Android Police