Android Nougat Beta Program Closes; Android O coming soon.
It was in March 2016 that Google started its Beta Program for Android Nougat. They released quite a few number of Beta Builds before the general release. The feedbacks received by the Developers from the Beta Testers helped them better the OS with each update, moving forward to 7.1.x from 7.0 build.
Now, Google has finally concluded that their Beta Testing for Nougat is completely over and they would soon begin testing of the next version of Android(O).
Thank you for your interest in the Android Beta Program! The beta for Android Nougat has concluded, and all devices that were opted in have been updated to the current public version. If you are still running a beta version of Nougat you may download the latest full OTA image for your device and sideload it. This will not wipe your device. We’ll update this site when the Android O Beta Program begins.
In the meantime, you’re welcome to talk to other interested users by joining our Android Beta Program G+ Community.
Google has already released its first developer preview of Android O to some selected device, and is expected to begin with the Beta Testing from this month itself. General(Stable/OTA) builds are reported to roll out by Q3 of 2017.