Report: watchOS 27 to improve heart-rate tracking; AI health coach may not debut at launch - 9to5Mac

watchOS 27 to improve heart-rate tracking on Apple Watch

Apple will announce watchOS 27 at WWDC 2026, with improved heart-rate tracking on Apple Watch as the headline health feature, alongside the delayed rollout of "Project Mulberry," an AI health coaching agent tied to Apple Health data. For tech managers evaluating wearable health platforms, the combination of incremental sensor refinement and a slipping AI agent timeline signals Apple is prioritizing reliability over feature velocity in its health stack this cycle.