2010 is the first year of the new design. It carried over the drivetrain from 2009, including the exhaust system which was a single outlet design. 2011 has the new 3.7l, 6 speed transmissions, and 8.8" rear ends. Dual exhaust came standard as well.
10'-12' is the same exterior body style. From 11'-12' they changed the v6 to the 3.7L that increased pretty much everything. Horsepower, torque, mpgs to name a few major improvements. The 11'-present 3.7 gets more HP than the 10' GT.
2011 Kona Blue 3.7L. Stock motor. Roush Axle-Back. 19" x 8.5/10" Charcoal AMR's. GT500 Spoiler. Smoked Raxiom Tail Lights. MCA grille. Shorty antenna.