# Apple Watch Series 12 and Ultra 4 launch and AI features > Live situation record from CLSTR: https://clstr.news/situations/apple-watch-hardware-and-software-updates > Updated: 2026-09-10T19:12:00.000Z. Sources: 206. Developments: 7. Following the ‘Surprise and Shine’ keynote on September 9, 2026, Apple has detailed the capabilities of the Apple Watch Series 12 and Apple Watch Ultra 4. Both models utilize the new S11 chip and run watchOS 27. The hardware features a redesigned Health Sensing System with larger, more efficient LEDs and expanded electrode surface areas to improve biometric accuracy. Key health enhancements include heart rate measurements taken every five seconds—60 times more frequent than previous models—and a 24-fold increase in heart rate variability (HRV) sampling. New software metrics include a ‘health age’ and a ‘Readiness’ score, which provides a daily 0–10 rating based on sleep, training load, and vitals to recommend activity levels. The Apple Health app is also undergoing a major redesign, which includes the introduction of a ‘Longevity’ tab. The Ultra 4 specifically offers extended battery life, with reports citing up to 50 hours of runtime and a specialized ‘Extended Workout mode’ providing up to 45 hours of tracking. In low power mode, the Ultra 4 can reach up to 84 hours. The Series 12 will be available in aluminum, titanium, and ceramic finishes. Apple is also introducing ‘Audio Intelligence’ features powered by Apple Intelligence, including ‘Siri Recap’—which generates high-level summaries of conversations—and ‘Live Rewind’, which allows users to view text snippets of the last 15 seconds of audio. Apple asserts that audio is not recorded or stored, stating that data is processed on-device or via Private Cloud Compute in a secure, isolated hardware compartment to ensure privacy. Retail availability for the new models is scheduled to begin on September 18, 2026. ## Claims - Apple is developing the Apple Watch Series 12 and Apple Watch Ultra 4. (corroborated by 25 sources) - iPhone 18 Pro and Pro Max are expected to be announced (corroborated by 19 sources) - Apple is scheduled to hold its annual event on September 9, 2026. (corroborated by 19 sources) - Apple is testing ceramic case options in white and dark grey for the Series 12. (corroborated by 17 sources) - Apple is testing continuous, all-day heart-rate tracking. (corroborated by 15 sources) - Apple is redesigning the Health and Fitness app interfaces to focus more on wellness metrics like sleep and recovery. (corroborated by 12 sources) - Apple may launch a foldable iPhone Ultra (corroborated by 10 sources) - The Apple Watch Series 12 and Ultra 4 are expected to feature an upgraded S11 chip. (corroborated by 10 sources) ## Timeline ### 2026-09-10: Apple announces AI-powered health app updates Apple is launching a redesigned health app powered by Apple Intelligence, featuring a ‘Health Age’ metric and AI-driven physical assessments to provide personalized wellness insights. 3 sources. https://clstr.news/cluster/apple-announces-ai-powered-health-app-updates ### 2026-09-10: Apple unveils Apple Watch Series 12 and Ultra 4 Apple introduced the Apple Watch Series 12 and Ultra 4, featuring the S11 chip, enhanced health sensors, a new Readiness score, and AI-driven Audio Intelligence tools. 83 sources. https://clstr.news/cluster/apple-unveils-apple-watch-series-12-and-ultra-4-with-advanced-health-sensors ### 2026-09-03: Apple expected to unveil new hardware at September keynote Apple is expected to announce new hardware, including the Apple Watch Ultra 4, during its upcoming September 9 keynote event. 2 sources. https://clstr.news/cluster/apple-expected-to-unveil-new-hardware-at-september-keynote ### 2026-08-29: Apple confirms September 2026 keynote to debut iPhone 18 Pro and foldable iPhone Apple has confirmed a September 9, 2026, keynote themed ‘Surprise and Shine’, expected to debut the iPhone 18 Pro, a new foldable iPhone, and updated Apple Watch models under new CEO John Ternus. 141 sources. https://clstr.news/cluster/apple-watch-series-12-and-ultra-4-expected-to-feature-advanced-health-tracking ### 2026-08-26: Apple Watch Series 12 rumors suggest health and AI upgrades Rumors suggest the Apple Watch Series 12 could launch in mid-September, featuring advanced health sensors, AI integration via Siri, and potential improvements to battery life and the Health app. 5 sources. https://clstr.news/cluster/apple-watch-series-12-rumors-suggest-health-and-ai-upgrades ### 2026-08-23: Apple Watch Series 12 and Ultra 4 rumors suggest AI hardware leap Upcoming Apple Watch models, including the Series 12 and Ultra 4, are rumored to feature AI-optimized processors, design refinements for better comfort, and potential Touch ID integration. 5 sources. https://clstr.news/cluster/apple-watch-series-12-and-ultra-4-rumors-suggest-ai-hardware-leap ### 2026-08-12: Apple Watch hardware and watchOS 27 updates expected Apple is preparing hardware upgrades for the Series 12 and Ultra 4 watches alongside watchOS 27, which will feature a consolidated Find My app and a dedicated Siri interface. 2 sources. https://clstr.news/cluster/apple-watch-hardware-and-watchos-27-updates-expected --- Cite as: Apple Watch Series 12 and Ultra 4 launch and AI features. CLSTR, https://clstr.news/situations/apple-watch-hardware-and-software-updates