Essential has rolled out Android Oreo 8.0 beta for PH-1 in November and after a month now they have rolled out Beta 2 OTA.
As per the change logs it brings new features such as Smart text selection, instant apps, Picture in Picture mode, Faster start-up , app sign-in , Google Play Protect Security scans and also brings December Security Patch.
It also brings some additional bug fixes related to Beta 1 update such as battery life improvements. Update weighs around 143MB in size.
December Security Patch
Smart text selection, instant apps, PiP
Faster startup and app sign-in
Google Play Protect Security scans
Issues Fixed from Beta 1
Android Auto and OEM Bluetooth Car Kit Interoperability Improvements
Data tracking issues for certain U.S. Carriers
Setup Assistant screen cut-off issues due to status bar Further Treble support
Battery life improvements
LED notification and charging behaviour