After Samsung promised four major Android updates for the Galaxy S22, Galaxy S22+ and the Galaxy S22 Ultra, the company has made a similar commitment for its latest smartwatches. Starting with the Galaxy Watch4 and Galaxy Watch4 Classic, all Galaxy Watch series devices should receive 'up to' four years of One UI Watch updates.
https://www.notebookcheck.net/Samsung-Galaxy-Watch4-Galaxy-Watch4-Classic-and-upcoming-Galaxy-Watch-series-devices-to-receive-up-to-four-years-of-software-updates.598703.0.html