https://arstechnica.com/gadgets/2018/06/android-p-preview-3-hands-on-heres-all-157-new-emoji-some-ui-tweaks/

Android P Developer Preview 3 came out yesterday, and we're here to break down all the changes in Google's latest in-development Android release. After Preview 2 was deemed a beta, Google is calling this release "Beta 2." There aren't a ton of changes in this release, mostly a bit of polish and some bug fixes. The latest release is currently available for Google's Pixel phones, while beta-compatible devices from Essential, Nokia, OnePlus, Oppo, Sony, Vivo, and Xiaomi will be updated in the coming weeks.

Just as has been the case for every major Android release for the past few years, it seems like Android P will come with a full version number bump. After Android 8.0 Oreo last year, Preview 3 of Android P refers to the OS as "Android 9" in the settings. "Android 9" would be a bit of a change from the usual "x.0" format. Google is also declaring the Android P APIs to be final with this release, so it is giving it the official designation of "API level 28," and Android P apps can now be uploaded to the Play Store. This build is also a bit more consumer-ready and doesn't show as many developer warnings and error messages as previous builds (Google shut off the banned API warnings).