watchOS 27 is arriving at WWDC 2026, and three features dominate the rumor pool: improved heart rate tracking accuracy, high blood pressure notifications, and a Modular Ultra-inspired watch face. These are not minor refinements. Blood pressure alerts would mark Apple Watch's first real expansion into hypertension monitoring, a space that affects roughly 1.3 billion people worldwide.
The more consequential question this video addresses is Siri. Apple's next-generation AI efforts are reportedly baked into watchOS 27 in a way that could make the assistant functional on-wrist for the first time in any meaningful sense. The argument being made here is not that Siri becomes great, but that it crosses a usability threshold it has failed to reach for over a decade.
Read the full breakdown before WWDC if you want to understand which of these three upgrades is hardware-dependent and which ships to existing Apple Watch models. That distinction matters and the video addresses it directly.
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