That motor was in development and it's not unusual for things to change, especially when a product is 2 years past it's original planned date. I'd still look for it in the future (after all, Ford puts a turbo on just about everything these days)...unless the next one is electric.
So Ford Powertrain worked on developing a twin turbo Coyote engine for the GT500 and at some point abandoned the project. They instead developed a supercharged variant and after a short production life will abandon that powerplant and go back to the TT that they shelved.