OnePlus is now seeding the latest Developer Preview 5 for its latest phones - the OnePlus 7 and 7 Pro. As the name states, it's a developer preview version of Android Q so it's not stable enough for day to day use.
The changelog states that the new version improves the system functions and stability. It also adds OnePlus' full-screen gesture navigation. The whole build is based on Google's Android 10 Beta 6.
The known issues, for now, are mainly compatibility problems with some apps, including Google Pay. Users also report system lag and stability issues from time to time.
Although OnePlus doesn't say anything about that, we are pretty sure that this would be the last Developers Preview update before the final version of Android Q arrives, which should be tomorrow, as per Google's customer support chats. There's also a rumor going around that OnePlus wants to release its software update shortly after Google's but we will see if the developers over at the Chinese company will pull it off.