Apple puts in the hands of developers first beta version of watchOS 6.2.8 with few changes from the current version. This beta version was launched a few hours later than the tvOS version and it seems that Apple is speeding up the beta versions to reach the WWDC as stable as possible. In this case, the new beta version for the smart watch does advise not to install it if you are not a developer, since a problem in the software could leave you without a watch for a long time and more so now that Apple's SAT is quite limited by the COVID pandemic -19.
The new beta versions for developers released do not offer changes in terms of functionality in the clock, they are novelties directly focused on improving the security and stability of the system. In this case we have to be calm because it seems Apple does have big changes planned in watchOS 7, which would be presented on June 22 along with the rest of the versions of its operating systems.
In short, what seems clear is that this week's beta versions are not adding major changes to the devices, so you don't need to install them if you're not a developer. In this case, remember that the watch version requires the beta version of iOS on the iPhone and that does not have a public beta version. A new version to fix small bugs and problems detected in previous versions, there is no more.