According to Jalopnik, Ford chairman Bill Ford Jr. has publicly stated that a turbocharged Mustang is on the way.
Ford Jr. didn't get into specifics, but likely engine choices would either be a 3.5-liter twin-turbo EcoBoost V-6 or a 2.0-liter EcoBoost turbocharged four-cylinder.
A turbocharged Mustang reminds us--and everyone else--of the late SVO that was offered in the early '80s. Whether Ford would use that name is unknown, but a modern SVO could be a fun fuel-sipper.