To the people bitching about dynamic shadows, have you even watched the damn trailer on the SH5 website? All the crewmen project shadows on the interior model and on themselves.
The trailer for the dynamic campaign is made of bits of footage not necessarily taken at the same time. Some early screenshots of the sub showed no dynamic shadows, later screenshots showed dynamic shadows.
On this screenshot, the conning tower and deck gun project a shadow on the deck:
http://img188.imageshack.us/img188/1296/75045028.jpg