Totally don't understand why you guys are thinking that a twin turbo 5.0 with a 10 speed auto from the factory wouldn't be amazing? Built right, which I'm sure they would, lays the foundation for incredible horsepower that you can dial in literally with the twist of the knob with minor mods. While I loved my 13 GT500, it was a beast to launch and shift at the track as the immediate torque often blew the tires off. Remember, we are talking 62mm turbos, so not a bad spool time but plenty big to provide enough power to eat a Demon.
If Ford were to implement a twin set up backed by the 10 speed auto, it would be a great platform to build upon, but would heavily prefer something other than the 5.0 coyote motor that's found in a run of the mill mustang GT. Sure it's a great motor, but I would expect Ford to use a different motor to set it apart from a mustang GT, just as they have all the other years the Shelby's have been in production. And I still suspect they will, even IF it's a 5.2 motor.