First watchOS 3 beta is now available for developersApple has seeded the first beta version of watchOS 3 to developers. The configuration file needed for the update can be found at the watchOS Developer Resource Center, and you can then download the update through the Apple Watch companion app on the latest beta version of iOS 10.
If you are interested in checking out the upcoming Apple Watch features ahead of their official release, you can install the beta now.
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First watchOS 3 beta is now available for developers