Google has made available a test build of the Android O operating system. You can download it from the developer page.
The trial Android O can be viewed on Google branded devices — smartphones Nexus 5X, Nexus 6P, Nexus Player, Pixel, Pixel XL and Pixel C. The assembly is not intended for ordinary users, it can only be installed manually.
In the new version of Android, you can configure application notifications, view videos in a small window on top of the main one (picture—in-picture mode), adaptive icons have also been added – their design adjusts itself to the selected theme, autofill forms, a new media player and other features.
The official announcement of Android O will take place in May 2017 at the annual Google I/O conference.
Source: Developer.android