I read the story in NS. Apparently it's capable of generating very high thrust forces per watt (per horsepower if you prefer). The problem is it can't maintain those forces when moving. In other words it might be great as a replacement for a helicopter rotor or to make a kind of hover craft or perhaps even to replace wings... but perhaps not for generating the forward thrust needed to propel an airplane. I believe they said the power drains off quickly as it starts to move.