https://techcrunch.com/2023/08/23/ios-17-beta-includes-further-hints-that-the-iphone-15-pro-will-have-an-action-button/

Apple has released iOS 17 beta 7 to developers and it includes further hints that the iPhone 15 Pro will have an “Action Button.” The new details, which were first spotted by 9to5Mac, seem to corroborate previous rumors that Apple will replace the mute switcher with a new Action Button.

iOS 17 beta 7 adds haptic feedback patterns for when the user enables or disables silent mode. These patterns will make the device vibrate more prominently when the user switches between them, which would be useful for new phones with an Action Button.