Apple Watch Series 12 and Ultra 4 are on track for September 2026, and Bloomberg’s Mark Gurman confirmed today that both models will skip a design overhaul in favor of what’s inside: a new processor for the first time in three years and a serious push on battery life.
The Series 12 comes in Wi-Fi-only and cellular variants (code-named N237 and N238), and the Apple Watch Ultra 4 carries the code name N240. All three are powered by a new chip identified as the T8320. Apple Watch processing performance has been stuck at S9-level since that chip launched with the Series 9 in 2023, carrying over through the Series 10, Series 11, Ultra 2, and Ultra 3 without real performance gains, an unusually long plateau for any Apple product line. With watchOS 27 beta 4 already in developers’ hands and Siri AI heading to the wrist, the T8320 upgrade is less about raw speed today and more about headroom for what is coming.
No redesign, but battery gets attention
Touch ID on the Apple Watch generated buzz earlier this year, but Gurman’s report makes it look unlikely. His characterization is that neither model will see major design changes, and adding a fingerprint sensor would require exactly that. What Apple is focused on instead is battery capacity, reportedly increasing the physical size of the battery alongside efficiency gains elsewhere. Battery life has been a persistent complaint for years, particularly on the standard Series models, and even a modest improvement matters given how aggressively watchOS 27 leans on always-on AI processing.
The health and fitness side gets iterative improvements rather than a breakthrough sensor. Among the best watchOS 27 features relevant to the new hardware:
- Workout Buddy gains data-driven motivation features covering pace, distance, and workout duration, and can now function without an iPhone nearby
- Indoor run tracking is improved
- Cycle Tracking gains perimenopause and menopause support, with notifications when logged cycle patterns suggest perimenopause onset, plus symptom tracking and educational resources
- Heart rate tracking improvements are expected, supported across current Apple Watch hardware as well
Siri finally comes to the wrist
The flagship watchOS 27 feature is the redesigned Siri. When Apple rebuilt Siri and launched Apple Intelligence two years ago, the Apple Watch was left out entirely. WatchOS 27 corrects that with a dedicated Siri AI app on the watch that syncs with the Siri app on iPhone, iPad, Mac, and Apple Vision Pro. For details on how the feature works before the hardware ships, see Siri AI on Apple Watch as it arrived in beta 3. For a device worn all day, a genuinely capable Siri is probably a larger functional upgrade than any sensor Apple could add this year.
Bigger changes are still a year or two out
Gurman notes there is ongoing work on a more significant Apple Watch redesign, but it is not expected until 2027 or 2028 at the earliest. Apple is also still targeting a blood sugar detection feature by 2030, a project in development since the Steve Jobs era, separate from the blood pressure monitoring work already underway for the Ultra line. The Series 12 and Ultra 4 are not that product. They are a necessary internal refresh: getting the chip back on track, extending battery life, and readying the platform for Siri AI before the bigger hardware rethink arrives. For anyone on a Series 11 or Ultra 3, there is probably nothing here that demands an upgrade. For anyone still running a Series 9 or older, the T8320 and battery improvements make a reasonable case.
