https://arstechnica.com/gadgets/2018/03/the-android-p-peanut-brittle-pez-pixy-stix-developer-preview-is-here/

In what is quickly becoming an annual March tradition, Google is once again releasing an early preview of the next major version of Android. The Android P Developer Preview is out right now for developers (and eager Android enthusiasts) to take for a test drive. It's still very early in the news cycle for Android P, and while we haven't installed it yet, we do have a lengthy Google Blog post to draw details from. Highlights include enhancements to the notification panel, indoor positioning, support for iPhone X-style notches, and a million under-the-hood improvements.

However, device support for this release is pretty limited: you'll need a Google Pixel phone to play. The developer preview works on the Pixel 1, Pixel 1 XL, Pixel 2, Pixel 2 XL, and that's it. Pour one out for the Nexus 5X, Nexus 6P, and Pixel C tablet, which were all part of the Android O developer preview but didn't make it to Android P. I actually confirmed this with Google—those three devices won't be getting Android P.