Mentioned my hope for some flashbacks. Well, it turns out there will be.
“Well, we can’t say too much, but we’re going to see his past and where he’s been since The Empire Strikes Back. Somebody pointed out he’s been kind of stuck in this one place, and now’s the time to actually go back in time and check out his journey and find out more about him.”
This quote fro Temeura seems to indicate we’ll at least see what he was up to between ROTJ and Mando, if we don’t go back even further.
EDIT: Also, Daniel Logan replied to someone on Twitter in a way that makes me think we might see Logan play a young Boba as well. I don’t know if he would reply this way if he wasn’t appearing, since the show has apparently wrapped. Who knows, though?