Multiple Galaxy Watch 4 series product slides have leaked online. The slides offer a considerable amount of details about the Galaxy Watch 4 and Galaxy Watch 4 Classic, which will both be available in two sizes. The slides also provide another look at One UI Watch, the replacement for Tizen.
https://www.notebookcheck.net/Samsung-Galaxy-Watch-4-and-Galaxy-Watch-4-Classic-product-slides-leak-ahead-of-August-11-unveiling.553423.0.html