According to Capitals' GM George McPhee, the team is done signing free agents this off season. Via  Tarik El-Bashir.

Asked if the Caps are "done" as far as free agent shopping, GM George McPhee nodded and said, "Yes."

So barring any trades, this will be the roster the Capitals will take into next season.

It would be hard to call the offseason an overwhelming success, but the team didn't make any bad moves and was able to re-sign key players while adding some organizational depth. Clearly they have faith in the team that finished with the regular season's best record just a few months ago.