According to website /Film, Rosario Dawson (Daredevil, Luke Cage) has been cast as Star Wars fan favorite character, Ahsoka Tano.

From the website, “We have exclusively learned that Rosario Dawson will appear in The Mandalorian season 2 and are excited to report that she will be playing a fan-favorite character previously only seen in the Star Wars animated productions. Dawson will be playing a live-action version of Ahsoka Tano, Anakin Skywalker’s Jedi padawan apprentice who appeared in Star Wars: The Clone Wars and Star Wars: Rebels. This would be the character’s first appearance in live-action.”
We here at BlackSci-Fi.com that this will soon be confirmed by Disney or Ms. Dawson herself soon. Head here for more details.