I love the new "special assignment" crew features, but that plus the Type XVIII (not XXI - the original announcement states that it's going to be the Walther boat) suggests that this is going to be very much a "secret weapons of the Kriegsmarine" add-on.
Not that I mind. I think some of the new engine additions will be handy and un-modding the uber-ness to be more realistic is easier than adding content.
And come on, the "casuals" are gonna love it. I mean that in a positive way