Precise renders of the Galaxy Tab S8 and Tab S8 Ultra have leaked, courtesy of OnLeaks. While Samsung will release the pair under the same series, they will look very different from each other, for better or worse.
https://www.notebookcheck.net/Samsung-Galaxy-Tab-S8-and-Galaxy-Tab-S8-Ultra-renders-leak-with-divergent-designs.574727.0.html