The watchOS 8 announcement is one of the most boring of the entire presentation. We were shown only one new watch face (and many expect exactly dials from the new watchOS), and even that is a refinement.
During the developer sessions, we noticed another one called World Clock. The watch face has a map with the time zones of dozens of cities around the world.
Most likely, the new watch face (perhaps there will be several) will be shown along with the Apple Watch Series 7, which will be presented this fall. Last year, the situation was almost the same: at WWDC, they showed two new dials, and with the release of new watches, a couple more were added.