Android 8.0 Oreo factory images available for download for Pixel and Nexus devices
Factory images for the following devices are now available for download via Google's website, but you'll have to flash them manually:
If you own a Pixel or Pixel XL smartphone, then you'll probably receive Android 8.0 Oreo via OTA (over the air), so you won't need to download the factory images.
However, the update is pushed in phases, which means it might not be available to everyone right away. The same goes for Nexus 5X, Nexus 6P, Nexus Player and the Pixel C tablet, which should receive the update as well.
It's worth pointing out that the update weighs in at around 50MB, so it's not really a sizable download. However, the size of the update will be much larger for smartphones not made by Google.