Apple today seeded the first betas of upcoming iOS 15.6 and iPadOS 15.6 updates to developers for testing purposes, with the new software coming two days after the launch of iOS 15.5 and iPadOS 15.5.
We don't yet know what might be introduced in iOS 15.6 and iPadOS 15.6, as Apple has now implemented all of the features that were announced as coming in the iOS and iPadOS 15 updates, and work on iOS 15 is likely winding down with iOS 16 approaching.
iOS 15.6 and iPadOS 15.6 could be some of the last updates to iOS 15 and iPadOS 15 as Apple is now working on iOS 16.