What's changing?
Apple announced an update to the Full Disk Access permission model in macOS. This permission is what allows an app to reach protected locations such as Mail, Messages, Safari data and other system files, and it must be granted manually by the user.
Why it matters
Full Disk Access sits at the center of macOS privacy protections. Any change here affects both how developers request the permission and how much access users grant to individual apps.
Open questions
So far the only available information is the headline on Apple's developer news page. The scope of the change, which macOS versions are affected, and what developers must do to comply are not yet clear.