http://wccftech.com/watchos-4-release-date/

Apple Watch users can download the watchOS 4 update on the 19th of September. Here are more details on watchOS 4 release date.

Though watchOS might be minuscule compared to what iOS, macOS and tvOS are capable of doing, but it’s an important part of the entire Apple ecosystem. With watchOS 4, Apple is pushing the Apple Watch to its limits and bringing new features to users that are surely going to please. There’s even more health related features in this release as well as new UI elements to give proceedings a brand new feel.