Front end styling looks slightly different to the S-Class. The headlights look a bit surprised, like slimmer versions of the ones on the SL, which isn't necessarily a bad thing.
Engine-wise, we should still see the twin-turbo V8 and V12 units seen on current Mercs. The Germans are also working on a twin-turbo 3-liter V6 for the C400 which could fit very well into the range.
The new S-Class could debut as early as April's Shanghai Auto Show, though this coupe should arrive towards the end of the year or even later.