As first reported by MacRumors, Apple has increased its internal testing of iOS 16.6 during the past week. The move suggests Apple will soon seed the first beta of the iOS 16.6 update to developers and public beta testers.
Apple has confirmed that the public release of iOS 16.5 will take place this week, meaning the first iOS 16.6 beta will likely be made available either later this week or sometime next week. Apple has been internally testing iOS 16.6 since at least early April. iOS 16.6 is likely to be one of the final updates in the iOS 16 software cycle, as Apple will announce iOS 17 at WWDC next month, shifting its main development efforts towards that version of iOS.
It remains to be seen which new features, changes, and bug fixes will be included. The iOS 16.6 release should be available to the public sometime around WWDC 2023, which begins June 5.