https://wccftech.com/android-p-developer-preview-3-factory-images-and-otas-are-live/

We got to see Android P in action back in March when Google had released the first ever developer preview of the yet-to-be-named version of Android. The second iteration was released at the same time as Google I/O, and today, the third version of the preview is being rolled out. It’ll be a while before we see a stable release of the OS, so the developer previews are all we have to get an insight into the changes it brings.

Unfortunately for Nexus users, Android Oreo is where support ends officially, as Google didn’t release a developer preview for Nexus devices. There may very well be community-developed Android P ports, but this is where Google draws the line. Currently, the only Google devices that support the release are the Pixel and Pixel 2, along with their XL variants.