Just to clarify, in my post about an EcoBoost 5.0, I wasn't saying the Boss should get it. I was really just saying it's a good candidate engine for the next generation GT500. It couldn't hurt since it would really just make the car more fuel efficient than the supercharger setup while maintaining the power and modability it currently has.
I, too, would like to see a special edition come out for either the current or new generation. A new Mach 1 or Bullitt would be pretty cool.