MacRumors published a story that Apple has released the eighth beta of watchOS 8 to registered developers.
Apple Seeds Eighth Beta of watchOS 8 to Developers
Apple today seeded the eighth beta of the upcoming watchOS 8 update to developers for testing purposes, with the update coming one week after Apple released the seventh watchOS 8 beta.
Apple Seeds Eighth Beta of watchOS 8 to Developers
To install watchOS 8, developers will need to download the configuration profile from the Apple Developer Center. Once installed, watchOS 8 can be downloaded through the dedicated Apple Watch app on the iPhone by going to General > Software update.