Samsung has confirmed that it will begin issuing One UI Watch beta builds for the Galaxy Watch4 and Galaxy Watch4 Classic, still the company's flagship smartwatches. The One UI Watch beta program will begin next week, starting in South Korea.
https://www.notebookcheck.net/Samsung-announces-One-UI-Watch-beta-program-for-the-Galaxy-Watch4-and-Galaxy-Watch4-Classic.622642.0.html