Well, I got a bit of stick on some forums for not making a futuristic enough submarine, so I tried again. This time I went deliberately a little overboard on the shape, and I've incorporated a few ideas which seem to be gaining credence. Here's the pics of the work in progress...
Here's my thinking. At the front we have some fancy sonars and passive listening, then immediately behind that would be the bouyancy tank. From there to the conning tower will be weapons bays for modular systems and launchers which can be quickly reloaded or replaced to suit the mission. There are no standard torpedo tubes as such, everything is located in the launch bays.
At the rear you have the habital spaces and a nice platform for special forces to work from. You could moor habitats or SDS style subs no problem, and using helicopters would be easier too. At the rear you have the azipods for steering, fully steerable in X and Y access for thrust vectoring. Each contains several electrically driven impellers in a shaped tube to use pressure to assist in stopping the formation of bubbles which cause cavitation noise. At the rear of the pod an external housing funnels 'clean' water around the wake to further reduce turbulence and noise.
Anything you think I've done completely wrong, bearing in mind I'm just making this stuff up?