This is some of the material in the packaged version I just received:
WWII Era Submarine DVD documentary
which is an additional DVD from the game DVD
Historical Map of the Pacific Theater
Naval ship recognition guide
this is a fold up poster style guide not in book form but usefull non the less
In depth manual including extra reference material
The extra material looks to be a 'hot' key layout and a default key commands listing
Have just started looking at the manual. Will see how good it is.
Just for the record the USS Lionfish made the cover!!!! Hull number 298 - looked it up and it's the Lionfish!
Happy Hunting