Apple has just released the Release Candidate for iOS 15.3 (iPadOS), macOS 12.2, watchOS 8.4 and tvOS 15.3.
For now, this RC is only available to developers registered on developer.apple.com. In terms of new features, do not expect a big update, especially for iOS, iPadOS, watchOS 8.4 and tvOS 15.3. On the other hand, it is possible that with macOS 12.2 RC Apple has made some bug fixes and other improvements that will make the system more secure. That remains to be seen after the first returns.
If you spot one or more notable new features in systems, please let us know in the comments.