The limited slip differential will have variable lock based on conditions thanks to the PDK hydraulic pump. The Carrera S redline thanks to lighter valvetrain parts will be raised to 7800 rpm. The car will be lighter, more powerful, more efficient, and better handling.
Expected more of a change to the exterior? So did we as MotorTrend's rendering just seems like a 997 that was slightly tweaked. Porsche styling is always mild changes though. We'll know for sure when the car is revealed officially in September at the Frankfurt Auto Show.