OnePlus 3 getting second Android 7.0 Nougat beta build, here is what's new
However, before getting the Android 7. Nougat update, OnePlus 3 users can enroll in the beta program to receive community builds before the official release. These builds aren't available for OnePlus 3T owners though.
The update is rolled out as OxygenOS Open Beta 9 and brings several optimizations, but very few new features. Most of the update is about general bug fixes and tweaks meant to streamline Android 7.0 Nougat before the final release.
According to the official changelog, OnePlus has added expanded screenshots and implemented some shelf design optimizations.
As mentioned earlier, more optimizations to the general UI and DPI have been added too, along with battery enhancements, stability and performance optimizations.
If you've already installed the previous open beta, you will receive the new one via OTA (over the air), but if this is the first beta you want to install on the OnePlus 3, you will have to flash it by ADB sideload.
Things that are NOT allowed: