Leak Hints at Four New Features for Apple Watch Series 12 and Ultra 4

Ahead of the announcement of the Apple Watch Series 12 and Ultra 4 later this week, code for the watchOS 27 and iOS 27 betas indicates a series of new features for the product line.

The information comes from a new message from Woozad member of the forum “pdfu.” Results include:

• New “Preparation” application: A completely new, separate Watch app called in code “Readiness”, separate from the existing Vitals app. The ‌watchOS 27‌ launcher apparently includes it in the default home screen layout immediately after the workout app, and the Watch companion app on ‌iOS 27‌ references the same app in its logic for organizing apps on the ‌home screen‌. Its name and placement next to the Workout app suggest that Apple is preparing a more substantial preparation or recovery experience for the Apple Watch.
• Richer strength workouts: Extensive health infrastructure to store individual sets, number of repetitions, weight, equipment, body side and duration.
• New optical detection system: A new family of sensors called “Sunstone4p0” with lower noise coefficients and channel selection based on wrist and orientation. This could indicate revised heart-sensing hardware on an upcoming Apple Watch, offering improved readings when the reflected pulse signal is weak and specialized detection based on the watch’s location.
• 128 GB of storage: A NAND storage profile tied to the T8320 chip for the Apple Watch Series 12 and Apple Watch Ultra 4 suggesting they could offer 128GB of storage, up from 64GB on previous models.

BloombergMark Gurman of , previously reported that the Apple Watch Series 12 and Ultra 4 would introduce new health and fitness features.

pdfu has become an intriguing source of code discoveries in recent weeks. The forum member had previously spotted references to two unreleased game controllers in the first macOS 26.7 release candidate, identified by the internal names T6502 and T1057, and separately found evidence in audioOS 27 beta 8 pointing to a four-speaker HomePod surround sound system and a new “Party Mode” feature.