This update is available for the Nexus 5X, Nexus 6P, Pixel C, Pixel, Pixel XL, Pixel 2, and Pixel 2 XL.
To grab the update through the Android Beta program, be sure to sign-up here. If the beta isn’t pushing through you want to get busy manually, you can grab each image or OTA file at the links below.
This the last update as an developer preview , we will be getting the final OTA update for the stable Android 8.1 in December or January, according to the 8.1 preview program overview. Google is calling this “near-final system images” and says that it should be used for “final testing.” The first 8.1 developer preview showed up at the end of October. You can see what’s new in Android 8.1 right here.
Links: Factory Images | OTA Files