Apple (un)officially calls 'Action' on iPhone 15 rumor season
Apple appears to have slipped in hints of a new feature in the latest beta of iOS 17 released this week — a new solid state Action Button. The multi-function button would replace the existing mute switch and is thought to be one of the marquee features coming to the high-end iPhone 15 Pro.
Just like the Action Button on Apple Watch Ultra, this is a taptic button. This implies the new device will have no remaining moving parts and a completely sealed chassis.
The latter implies these iPhones could become more waterproof and resilient than they already are.