So far for the second season, we know that show overseers Jon Favreau and Dave Filoni will both get behind the camera (Filoni directed two last time) and that Michael Biehn is among the cast, with Rosario Dawson all but confirmed as a live-action Ahsoka Tano. Production wrapped in March before the big Coronavirus shutdown, so the series should be on Disney+ later this year.
Hear Filoni talk Clone Wars and sidestep questions about the future of The Mandalorian on the Empire Podcast.