This was posted in the last Autobild magazine. Mercedes is working on a C400 Biturbo that will employ a 4-l V6 engine with twin turbocharging and develop 408-horsepower. 0-100 km/h is estimated to be in an insane 4 seconds. The car will be available in RWD as well as 4Matic AWD.
Once I obtain more info, I'll keep you guys updated.
-CW