The new update bears version number V3.09 and weighs in at 3.2GB. It brings all the standard Android 11 features like improved permissions and notifications management alongside some nubia exclusive UI tweaks like picture in picture mode, app cloning and new avatars for the back panel. Game space has gotten a design refresh too.
Weirdly enough the security patch is only on September 2020 which is now two months behind. Hopefully, nubia will provide a more recent version in time for the official release. You can check out the Via link for step by step instructions on how to install the Android 11 update on your nubia Z20.