If you are into what is needed by the US Navy, when, why and how much - then I suggest you read this:
http://www.cbo.gov/showdoc.cfm?index=6304&sequence=0
I read it last night (off a print out), the submarines may get smaller and be of the attack kind, this agrees with what Seahawk has been saying.
Also notice the amount of
Littoral Combat Ships there will be in the future, and this topic called "Sea-Basing".
I plan to read some more next weekend, interesting stuff.
One idea was having ships not coming into port every six months for crew rotation. Instead the ship would stay out to sea for two years with partial crew changes flown in via helicopter. This is supposed to save money somehow.