Beta testers in the Apple system software programs will find iOS 15.4 beta 4, iPadOS 15.4 beta 4, and macOS Monterey 12.3 beta 4 available to test on their enrolled devices.
Beta 4 of iOS 15.4 adds a new Siri voice option, called American Voice 5, which appears to be a gender neutral tone.
Betas of iOS 15.4 also includes a new stalking warning during AirTags setup, informing the user that in some parts of the world using an AirTag to track someone without permission may be a crime.
Additionally, iOS 15.4 beta includes support for using Face ID with a mask, iCloud Keychain notes, new Emoji icons, an Apple Card widget, support for COVID EU digital vaccination passes, and support for contactless payments with Tap-to-Pay which allow an iPhone to accept payments directly. iPadOS 15.4 beta also includes support Face ID with a mask, new Emoji icons, iCloud Keychain notes, and the Apple Card widget.