Google released Android 8.1 Oreo Developer Preview 2 with build number OPP6.171019.012 for all supported devices. Unlike the developer preview 1 update, this new update does not include many new features, instead it mainly focuses on stability and performance of the OS. This update includes November security patches, enables ‘Pixel Visual Core’ on Pixel 2 devices (Google’s first custom-designed co-processor for image processing. Once enabled, apps using Android Camera API can capture HDR+ shots through Pixel Visual Core) and other enhancements.
This is the final preview of Android 8.1 Oreo and supports Pixel 2, Pixel 2 XL, Pixel, Pixel XL, Pixel C, Nexus 6P and Nexus 5X). Users who are opt-in for Android Beta program will get the OTA update that updates your device to Android 8.1 without losing data. If you prefer manual installation, factory images are now available for download at Android downloads page.
Besides the latest optimizations, general bug fixes, and the November 2017 security patch updates, Android 8.1 Oreo Developer Preview 2 includes optimizations for Android Go (for devices with 1GB or less of memory), as well as Neural Networks API (accelerate on-device machine intelligence) and Pixel Visual Core.
It seems that Google will launch stable version of Android 8.1 Oreo in December (not yet confirmed). However, early adopters can test out it right now. Factory images for Android 8.1 DP 2 (build number OPP6.171019.012) are now available for download, which you can flash manually on supported devices.
If you have opted for Android Beta program, you will get the OTA (over the air) for the new update. You can sign-up for Android Beta program by going here.