https://adtmag.com/articles/2018/07/03/android-p-beta-3.aspx

The next big Android mobile OS update is entering the home stretch, as developer APIs have been finalized and the dev team has issued an early release candidate build. The consumer release successor to Android O (Oreo, or 8.0) is scheduled for sometime this summer.

That early release candidate build is officially named Beta 3, the dev team announced in a blog post yesterday (July 2).