Apple Watch Ultra 4 leaks point to slimmer chassis, AI-driven features, and enhanced health tools

Tom's Guide’s roundup of last‑minute leaks on the Apple Watch Ultra 4 suggests a potentially slimmer case, possible under‑display fingerprint tech, and a doubling of sensors vs Ultra 3, with health upgrades like hypertension/blood pressure monitoring and a redesigned Health app. WatchOS 27 is expected to bring Siri Gemini AI and a personalized wellness concierge, while battery life may edge up thanks to a more power‑efficient processor. A price lift beyond $799 is possible; preorder could start soon after a Sept. 9 reveal, with shipping in the following week, though many specs remain unconfirmed.