That follows a final developer preview which is available now, and which if you’re enrolled in the Android Beta Program you should get in the next few days.
Android 8.1 is designed to improve performance on Android Go devices and adds a new Neural Networks API to accelerate on-device machine intelligence, as well as featuring other smaller enhancements.
The latest beta build meanwhile includes optimizations, bug fixes and security patch updates, but perhaps most interestingly it enables Pixel Visual Core on Pixel 2 handsets.
We’ve reported on this before and it should improve speed and battery efficiency when shooting HDR photos.
If you’re not using a Pixel or Nexus handset then you might have a while to wait for Android 8.1, or even the original version of Android Oreo, but most recent flagships should get it sooner or later.