Apple Watch Series 12 Tipped for Four Major Upgrades: Blood Pressure, Thinner Design, New Chip, and Band-Based Sensor

With Samsung Unpacked four days away and Apple's September event roughly two months out, 9to5Mac has consolidated the four most credible Apple Watch Series 12 rumors into a single forecast. Here is what the leaks suggest and what buyers should do now.

1. Blood Pressure Notification (Under FDA Review)

Apple's hypertension notification feature — which uses heart rate sensor data to detect patterns of high blood pressure over 30-day periods — is currently under FDA review. If cleared, it could debut with watchOS 27 and the Series 12 this fall. This is not a blood pressure reading; it is a trend-based alert system similar to Apple's existing irregular rhythm notification for AFib.

2. 15% Thinner Case Design

Supply chain reports from TASC (Taiwan-Asia Semiconductor) indicate the Series 12 will feature a 15% thinner case compared to the Series 11. This aligns with Apple's push to slim down its product line — the iPhone 18 Air is reportedly Apple's thinnest phone ever. The slimmer profile would make the Apple Watch more comfortable for sleep tracking.

3. New S12 Chip with Improved Neural Engine

A new S12 chip is expected to power the Series 12, with a focus on improving on-device machine learning for health features. The upgraded neural engine would enable faster processing of blood pressure, ECG, and sleep apnea data without relying on the paired iPhone.

4. Health Sensor Embedded in Silicone Band

The most unusual rumor comes from leaker Kosutami, who claims Apple will inject-mold a new health sensor into the silicone band itself. The sensor would only work with Apple's first-party silicone bands, not third-party or metal bands. No details on what the sensor measures have been provided.

What This Means for Buyers

The Apple Watch Series 11 at $299 remains excellent value and will receive watchOS 27 in September. If you specifically want blood pressure monitoring or the thinner design, waiting for the Series 12 announcement in September makes sense — but expect a higher price of $399–$429. The Apple Watch Ultra 3 at $640 is also worth considering if the Ultra 4's blood pressure feature doesn't materialize. Compare all smartwatches in our smartwatch guide.