Apple is expected to keep watchOS 27 focused on refinements rather than major new features, according to Bloomberg's Mark Gurman. The update will reportedly improve heart-rate tracking on Apple Watch, although details remain unclear. Gurman also said Apple's AI-powered health coaching project, internally known as Project Mulberry, may not be ready for the initial watchOS 27 release. The company is still believed to be developing a redesigned Health app, while watchOS 27 could also bring performance improvements, a new watch face, and additional Apple Intelligence features.