Chinese smartphone firm, OnePlus has released a new OxygenOS Beta update based on Android 8.0 Oreo for the OnePlus 3 and 3T. The OnePlus 3T receives OxygenOS Beta 16, and the OnePlus 3's version is OxygenOS Beta 25.
With Android 8.0 Oreo Beta for OnePlus 3/3T, you'll get new Settings and Notification panel UI, latest features including Picture in Picture (PIP), Adaptive icons, Autofill, Notification timeout, and new emojis.
Note that most major aspects of the phone are working as expected but fingerprint actions may be slower than you are used to, shortcut to access Google Photos is unavailable, some stability issues with NFC and bluetooth. OnePlus plans to optimize performance and compatibility of 3rd party apps in the next update.
OnePlus has already confirmed that the "Flagship Killer" OnePlus 3 and OnePlus 3T won't be getting any major OS updates after Android Oreo. You can download the OxygenOS beta based on Android Oreo from the below link.