MacRumors published a story that Apple has released the release candidates for iOS 15.2 and iPadOS 15.2 to to registered developers.
Apple Seeds Release Candidate Versions of iOS 15.2 and iPadOS 15.2 to Developers
Apple today seeded the RC versions of upcoming iOS and iPadOS 15.2 updates to developers for testing purposes, less than a week after seeding the fourth betas and six weeks after the launch of iOS 15.1 and iPadOS 15.1.
Apple Seeds Release Candidate Versions of iOS 15.2 and iPadOS 15.2 to Developers
iOS and iPadOS 15.2 can be downloaded through the Apple Developer Center or over the air after the proper profile has been installed on an iPhone or an iPad.