And from the horses mouth (pardon the pun) the Ford Media Center...

And from the horses mouth (pardon the pun) the Ford Media Center - BENCHMARK FOR STREET AND TRACK, FORD INTRODUCES MUSTANG DARK HORSE AND NEW FAMILY OF TRACK-ONLY RACE PONIES

"A special team of Ford engineers, designers and experts worked for more than three years to create Mustang Dark Horse, a street and track-capable performance Mustang with striking visual cues and all the capability sports car lovers expect, right down to the available carbon fiber wheels from Carbon Revolution (late availability). Mustang Dark Horse is the first new performance name for the brand since Mustang Bullitt was introduced in 2001".