The USS Freedom (LCS-1) is docked at the Charlestown Navy Yard through tomorrow. The crew is offering free tours from 12:30-4:30. I visited this afternoon and was very impressed. If you don't mind waiting out in the cold I recommend checking it out.
Yeah it's brand new. It was commissioned in November and is one of two designs in competition for production as a new class of ship (littoral combat ships).
It incorporates a lot of new technology and is filling a newly created role. The sleeker construction and reduced mast make it stealthier. It was pretty cool to get to tour such an advanced ship.