Earlier today Google took the wraps off its new consumer-facing features coming in Android 10 Q, due to be finalized and released to Pixel devices in late summer. And now the company has unleashed the third beta build of the software to no less than 21 smartphones from 13 manufacturers (including itself with all Pixels). It's the greatest number of handsets ever to participate in an Android beta, and this has been made possible by the launch in 2017 of Project Treble as part of Android Oreo. Last year at Google I/O there were 8 devices from 7 partners joining the P beta program, together...
Source: https://www.gsmarena.com/android_10_q_beta_3_is_now_available_for_21_smartphones_from_13_brands-news-36937.php