The 2010 base mustang had a V6 with 210 HP where the 2011 base mustang had a V6 with 305 HP (5 more than the 2010 GT with a V8). I have no problem with a smaller engine if the car is faster. Technology can be a wonderful thing.
As far as concept drawing go, this was a concept drawing of the C6 corvette:
So I doubt the final car will look anything like the drawing.