August 18th, 2011? Possibly a few tests after this have already happened?

Edit: Looks like no third flight yet. Found this followup: http://www.darpa.mil/threeColumn.aspx?pageid=2147485247

Also found this paragraph to be interesting:

“The initial shockwave disturbances experienced during second flight, from which the vehicle was able to recover and continue controlled flight, exceeded by more than 100 times what the vehicle was designed to withstand,” said DARPA Acting Director, Kaigham J. Gabriel.