Apple is releasing a firmware update for the AirPods Pro today, upgrading the previous firmware version 2D15 to 2D27.
No details on this firmware update are available at this time. Considering that Apple previously added new space audio to the AirPods Pro in iOS 14 space audio essentially uses the advanced motion tracking and Device positioning technology provides surround sound.
AirPods Pro firmware updates typically include performance improvements, bug fixes, and feature tweaks.
For checking the AirPods Pro firmware version need to connect the headset to their iOS device first. Go to Settings - General - About this device - AirPods Pro to view it.