Apple Watch Series 12 and Ultra 4: code points to Readiness app and other unreleased features

Code references in Apple’s watchOS 27 and iOS 27 betas point to several unreleased Apple Watch features tied to the expected Series 12 and Ultra 4, according to a MacRumors report summarizing findings from forum member pdfu.

These are software and hardware strings in pre-release builds, not an Apple announcement. Features found in betas can change or never ship.

What the code appears to reference

MacRumors reports four clusters of references:

• Readiness app: a separate Watch app named “Readiness,” distinct from Vitals, and placed near Workout in default Home Screen logic
• Richer strength workouts: health data fields for sets, reps, weight, equipment, body side, and duration
• Optical sensing changes: a sensor family labeled “Sunstone4p0,” described as lower-noise and orientation-aware
• 128GB storage: a NAND profile linked to a T8320 chip identifier for Series 12 and Ultra 4, up from 64GB on recent models

Bloomberg’s Mark Gurman has separately reported that the Series 12 and Ultra 4 are expected to emphasize health and fitness improvements without a major redesign. That reporting supports the direction of the code findings but does not confirm any single feature.

How to read this before Wednesday

Treat the list as possible upcoming capabilities, not confirmed Series 12 or Ultra 4 specs. Apple’s September 9 event is the confirmation layer for what actually ships.

Source: MacRumors — leak hints at four new Apple Watch features