I believe that there is an experiment underway to create a dynamic map for DW. Of course it's not the ENTIRE ocean like in SHIII, but it's not bad. It's more fun MP than Single player though. They have a pretty darn dynamic mission for the download. Be sure to read the docs included with it before playing it.
See this thread:
http://www.subsim.com/radioroom/showthread.php?t=107019
Where DW really shines is Multiplayer games.