The changelog includes new Dolby Atmos integration with the OnePlus Bullets Wireless Z, optimized volume adjustment, improved battery life and system stability, and general fixes and patches. The update also includes two new camera features.
The other feature spotted on the Oxygen OS Beta build was 4K recording with the ultrawide camera, but its still not mentioned in the notes. Can someone with the update check to see if the update added this option?
To check for the update, head to the Settings > System > System updates. OnePlus usually stages their rollouts so you probably won’t be able to pull the update right away. The build is coming to global and EU variants "soon" with a build number of 10.0.11.