It's out already, it's a docu/drama pretty good - and the details are far more interesting than the usual very glossy overview most modern documentaries on WW1 produce - but yes it's not super in depth. Mostly good for the aircraft dogfighting scenes as the CGI there is I think excellent compared to other WW1 movies that used that. The ground scenes are actors over CGI and not as convincing but still interesting. I did see a strange wandering aircraft on a view of the airfield above in episode 1, seems no one in the film making spotted it flying through people and heading to the side of a tent.
Still it's enjoyable for WW1 nutters.