I heard about this happening way back in December and thought they’d announce this by March but with everything shutdown, the announcement timeline changed. I think it was pretty obvious that it was in the work since Ashoka was the main focus of Season 7 of The Clone Wars and her casting addition to The Mandalorian.
Dave Filoni is finally running his own Live-Action Star Wars TV series and it’s pretty clear that he’s the Heir To The Empire.