From a Greek blog...but the pics give a small hint:
http://www.autoblog.gr/2010/08/18/sp...28/#more-24632
But the basic changes from the photos seem to be a bulge on the bonnet (which hides a 6.2 litre supercharged V8 pumping out 557bhp and more importantly 747Nm of torque), a bigger front splitter and bigger rims and exhaust. Transmission is a 6-speed automatic gearbox.