Bish
There has been talk about this for a few years now, hopfeully it will be out for the 80th anniversary of the 8th next year.
That might be pushing it. If they're doing filming now, figure another year of post production with CGI once filming wraps up. This year is half over already. I'd wager a 2023 release more likely. That would mark the 80 year anniversary of the highest loss rate missions in summer of '43. From what I've read on the series, they look to be using the 100th Bomb Group as their focus point.