I agree with the comments posted however I suspect that the actual high end speed will be classified, the same as with carriers. Note the article does not state if the “gas turbines for extra speed” were engaged...
From a link on the reference article:
Notable achievements during the trials included reaching a sustained speed of 44 knots during the required four-hour full-power run, with a top speed in excess of 45 knots. Many of the test events were conducted in high sea-state and wind conditions (8-foot waves and winds in excess of 25 knots). Despite the weather, the ship repeatedly reached speeds of over 45 knots with propulsion and ride-control systems operating in full automatic mode, proving the effectiveness of the control systems and the highly efficient and stable characteristics of the trimaran hull form.
A series of high speed ahead and astern maneuvers in these sea state conditions proved the effectiveness of the ship’s four steerable water jets. During the repeated high-speed turns the ship demonstrated excellent agility and stability characteristics. The ship’s flight deck remained stable despite sea state conditions and maneuvers.
http://finance.yahoo.com/news/General-Dynamics-Littoral-prnews-1935596371.html?x=0&.v=1
Someone will go down in Naval history as the first person to water ski behind that SOB!
So it could have made about half that speed if they'd just set up sails and run before the wind?