This looks really good. But it's way too early to get excited.
Decent trailer but, is it just me, or is the narrating kinda weird?
Also, I think that U-boat games should be released exclusively in spoken German language with English subtitles. The English IMO takes away from the atmosphere.
In the trailer (besides factual mistakes) I'm actually missing very loud bell and 'ALAAAAARMMMMM!!!!' before the planes buzz the uboat.