While macOS Monterey is still new, the operating system is constantly being updated with features and fixes. Apple has already released the second 12.1 beta to developers as well as public beta testers.
New features in macOS Monterey 12.1
The major new feature of this beta is SharePlay, which allows people to share an experience while watching video, listening to music, or even an app window while on a FaceTime call. SharePlay was disabled in the macOS Monterey betas before the official release. SharePlay will launch to the public in a software update.
Read more at Macworld.com