For questions about the Android Beta Program or the official beta version of the latest Android OS.
The Android Beta Program gives you an opportunity to try out pre-release versions of Android and provide feedback. Devices that you opt-in to the program will receive an over-the-air (OTA) update to the latest beta version of Android. The updates that you'll receive as a part of this program are pre-release versions and may contain errors and defects that can affect the normal functioning of your device (see known issues).
Further reading: https://g.co/androidbeta