https://wccftech.com/download-ios-15-2-and-ipados-15-2-beta-1-now-available/

Apple has released beta 1 of iOS 15.2 and iPadOS 15.2 for iPhone and iPad. The update is available for registered developers only.

Available to registered developers at first, we are certain that this update will be made available to those enrolled in the beta software program in a short while.