I'm really looking forward to seeing what Ford brings to the table in MY2015. Word on the street is that it will be an end to the retro-styled Mustang, switching to their new "kinetic 2.0" design language (read: aston martin-ish front grille) which could translate very well into a Mustang.
I also fully expect the 650hp GT500 to be only a very marginal real-world performance increase over the Boss 302, simply because the Boss is a more balanced track car. The Shelby's have always had issues laying down that power, particularly on a road course.
///M Power - 2011.75 LMB M3 6MT (fuelly)