Apple immediately after the release of the stable version iOS 16.5 released the first test firmware iOS 16.6.
What is known
The update is currently available to developers. To install a new version of the system, you need to go to the iPhone settings and in the “Software Update” section select Beta Updates, and then specify your Apple ID. As for the test firmware for everyone, it will be released in the coming days.
Unfortunately, Apple has not yet disclosed the list of innovations in iOS 16.6. Most likely, the system corrected errors and worked on optimizing the software. By the way, iOS 16.6 is the last interim firmware before the release of iOS 17.