EcoBoost V8 powered Ford Shelby Mustang in the works?

Here's a rumor that actually makes a lot of sense - an EcoBoost V8 powered Mustang. We've already got 4 and 6 cylinder EcoBoost engines in the works, why now an 8 cylinder?

And the rumor is that the boosted V8 would be under the hood of a Mustang, a Shelby Mustang at that. In other works, a direct injected, twin turbo, V8 powered Mustang. Let the enthusiasts and aftermarkets of the world commence drooling now.

While there is nothing wrong with the current GT500's supercharged 5.4L, it does get pretty bad gas mileage. And with the ever looming threat of a ZR1 Camaro on the horizon, it makes sense that Ford would be ready to win the horsepower war at the top.