Notably, the new software emerges approximately 2 weeks after Apple introduced iOS/iPadOS 16.6 beta 3.
Explore more: Apple unexpectedly releases iOS 16.5.1 to address issues with the Lightning to USB Camera Adapter.
Currently, registered developers can choose to participate in the beta by opening the Settings app, navigating to Software Update, selecting 'Update Beta,' and enabling iOS 16 Developer Beta. Please note that an Apple ID linked to a developer account is a prerequisite for downloading and installing the beta version.
Regrettably, Apple is currently not revealing what new features they bring in the latest trial version of iOS/iPadOS 16.6. In all likelihood, this is just a minor update, focusing on addressing lingering issues.

Notably, iOS 16.6 and iPadOS 16.6 lay the groundwork for iMessage Contact Key Verification. Its purpose is to enable Apple device owners to verify they are messaging the intended recipients, not impostors or eavesdropping hackers.
This feature is designed for Apple users facing 'specific digital threats.' Apple reveals they designed the iMessage Contact Key Verification feature for journalists, human rights activists, government officials, and others at high risk of cyber attacks.
Apple states that iMessage Contact Key Verification will be available on iPhones and their other devices at some point in 2023, marking one of the last features we expect to see in iOS 16. In the first two beta versions, hints of iMessage Contact Key Verification were present, but the feature is not yet fully activated.