Apple Watch Series 12 and Ultra 4 Expected to Bring Advanced Health Tracking

Apple may introduce a new band-attachment system for the Apple Watch Series 12 and Ultra 4, which could make existing bands incompatible with the new models.
The rumored all-day heart-rate monitoring could create a battery-life trade-off, since continuous sensing would require substantially more power than the current system, which typically measures heart rate every few minutes and switches to continuous tracking during logged workouts.
The suspected watchOS 27 update could bring more detailed strength-training records, including tracking additional sets and storing information such as exercise duration and repetitions.
Apple is reportedly considering broader future wearable options in response to screenless fitness trackers and smart rings, including premium models beyond the Ultra and Hermès lines and more affordable models beyond the current SE.
The rumored Readiness app is reportedly positioned immediately after the Workout app in the default watchOS 27 Home Screen layout, suggesting Apple may be integrating recovery features closely with exercise tracking rather than treating them as part of the existing Vitals app.
Apple is expected to unveil the Apple Watch Series 12 and Ultra 4 on September 9 at its "Surprise and Shine" event, according to Tom's Guide and Yahoo Tech. The new watches will likely keep the familiar design of current models but add health-tracking upgrades. Rumored improvements include better heart-rate sensing, a new Readiness app for recovery insights, and double the storage at 128GB.
The most significant change could be continuous heart-rate monitoring, Tom's Guide reports. Today's Apple Watch measures heart rate every few minutes and only goes continuous during workouts. Tracking all day would rival health trackers like Oura Ring 5 and Whoop 5.0 but could drain the battery faster.
Code discoveries suggest both the Series 12 and Ultra 4 will jump from 64GB to 128GB of storage, according to T3 and Yahoo Tech. The extra capacity could support expanded health data, workout logs, and downloaded apps. This marks the first major storage upgrade in years for Apple's watch line.
A rumored Readiness app will help users plan workouts based on recovery and energy levels, Tom's Guide reports. The feature would sit next to the Workout app on the home screen. It promises to deliver stronger heart-rate-variability data and give Apple's watches a closer focus on wellness, not just exercise tracking.
Strength workouts will gain more detail too. Tom's Guide suggests watchOS 27 could track additional sets, exercise duration, and rep counts. Today's Apple Watch logs basic strength data. The upgrade would appeal to users who lift weights or do resistance training.
The Series 12 and Ultra 4 will likely keep the same basic shape as current models, Tom's Guide and T3 indicate. However, Apple may add ceramic finishes, new color choices, and fresh band designs. A possible new band-attachment system could make old bands incompatible with the new watches.
Apple is reportedly planning to announce AirPods 5 at the September event, Yahoo Tech reports. The new model could feature an H3 chip, better voice isolation, and stronger noise cancellation. Spatial audio support may also arrive to match the premium AirPods Pro experience.
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