Google released the third Android Q beta during Google I/O 2019 for Pixel smartphones, but 21 other non-Pixel smartphones were also eligible for the beta. The OnePlus 6 and OnePlus 6T both received betas at this time, while the OnePlus 7 and OnePlus 7 Pro received betas shortly after launch. OnePlus' first beta wasn't meant to be used as a daily driver since it's only intended for developers, but OnePlus went ahead and continued work on the Q beta to fix bugs and bring it closer to the existing OxygenOS experience on Android Pie. Now, OnePlus is ready to release its third Android Q beta.

OnePlus 6 Forums  OnePlus 6T Forums  OnePlus 7 Forums  OnePlus 7 Pro Forums

Over on the OnePlus forums, OnePlus' Global Product Operations Manager Manu J. published "Android Q Developer Preview 3" builds for the 6, 6T, 7, and 7 Pro devices. He notes that upgrading from the previous beta to the newest one requires a full data wipe. There are issues involving the in-display fingerprint scanner icon not appearing on the ambient display for the 6T, issues with facial recognition stability on the 7 series, and other general stability and application compatibility issues.

The last Q beta brought substantial improvements to the OxygenOS software build on top, so we're expecting similar improvements in the newest Q beta. XDA Senior Member jhakjhuk1853 shared a screen recording of the latest DP3 HydrogenOS beta (HydrogenOS is the Chinese version of OxygenOS) in case you're wondering what Android Q currently looks like on the 7 Pro:

If you're ready to update to the latest Q beta, then visit the threads linked below. The instructions to update or rollback are straightforward as everything can be done using the built-in updater app.

Q DP3 for OnePlus 6/6T   Q DP3 for OnePlus 7/7 Pro