[Nightmare]

Cold War era would be interesting (and a huge change for the Silent Hunter series), but Dangerous Waters has already filled that role. Modern nuclear submarines spend very little time on the surface (in transit to and from base), and very little time at periscope depth. 98% of the time they are deep where they are in their element. Now if you exclude (for realism sake) external views there really isn’t anything to look at besides sonar consoles, which aren’t going to look any better running the latest greatest CPU and GPU combo than they do in DW.

Pre-nuclear age submarines are where you are going to get the best benefit when it comes to graphics. This is because subs before nuclear power were nothing more than boats that could submerge to hide or attack. They also relied on optical means for targeting.

Besides, let's at least let SH4 hit the shelves and go thru it's period of time for patches before moving on to the next title. For all anybody knows, SH4 could sell poorly and it could be the last title we see under the Silent Hunter name.