iOS 15.2 is the next upcoming version of Apple's proprietary software for iPhones. According to a prominent industry correspondent, it is the one that will start adding features intended to prevent abusive content reaching a child's device. It might contain measures to help allay well-publicized concerns about its impact on privacy.
https://www.notebookcheck.net/iOS-15-2-is-the-update-in-which-Apple-will-start-to-roll-its-anti-CSAM-system-out.584525.0.html