Apple just seeded the fourth beta of watchOS 4.2.2. To download the latest beta, you need to be a registered developer, and have the appropriate configuration profile installed. Then you can find it easily in your Settings under “Software Update”.
This beta update is likely to be only about under the hood improvements. We should also note that the previous three betas have not seen any feature or design changes either.
What features would you like to see in the next watchOS update?