Google has announced that the Android P Developer Preview is now available for download for those who want to test the upcoming Android flavor on their supported devices.
Android P Developer Preview comes with new features and UI changes like Indoor Positioning with Wi-Fi RTT, Display cutout support, enhanced messaging experience, Multi-camera support, camera updates, and Security enhancements, to name a few. Do note that this is a very early build of the software and not yet ready for regular use. Supported devices are the Google Pixel, Pixel XL, Pixel 2, and Pixel 2 XL.
The P Developer Preview runs from March 7, 2018, until the final Android P public release to AOSP and OEMs, planned for Q3 2018.
source: Android