MacRumors published a story that Apple has released the first beta of watchOS 10.3 to registered developers.
Apple Seeds First Beta of watchOS 10.3 to Developers
Apple today seeded the first beta of an upcoming watchOS 10.3 update to developers for testing purposes, with the beta coming a day after the launch of watchOS 10.2.
To install the watchOS 10.3 update, developers will need to open the Apple Watch app, go to the Software Update section under "General" in Settings, and toggle on the watchOS 10 Developer Beta. An Apple ID linked to a developer account is required.
