Very interesting enterprise. Considering that bunker-fuel-burning container ships are a leading cause of air pollution, this project is good news. Small ships, though, only 9000 tons, smaller even than some of the largest sail-powered cargo ships of 100 years ago. The rig is an old idea, a configuration called DynaShip designed in the 1970s by a German engineer named Willhelm Prolss. To my knowledge the only vessel to employ this rig so far is the megayacht Maltese Falcon, launched in 2006. Much like a square-rigger, but designed with rotating masts, sails furled in the masts which open out between the booms, and a much more sophisticated understanding of the airfoil shapes. Glad to see it getting used, it will be interesting to see how it works outside of the Med and the Caribbean.   

Thanks to Jack Tar Magazine for the tip!