Denmark Disney+ ad has (accidentally?) confirmed the casting of Rosario Dawson and Timothy Olyphant in season 2: https://thedirect.com/article/the-mandalorian-season-2-disney-rosario-dawson-timothy-olyphant-cast
The ad has now been taken down.Almost certain that Ahsoka Tano will be in the show now. As for Timothy Olyphant, of course a lot of people say Cobb Vanth from the Aftermath trilogy; I haven’t read those books in ages though so I’ve forgotten who he is.
I haven’t read the books, but from what I’ve gathered Vanth bought Fett’s armor from some Jawas and is posing as him.
Also the ad was in German, not Danish. Not that it’s important, but as a Scandinavian I felt that I should point that out.