Along with the carplay story that we were able to break yesterday we also had another holiday gift that Santa dropped off early and that was the C Class Coupe Ordering Guide. A lot of really good information in there, most notably at the moment is the lack of C450 model. It appears, at least at this time that the only models available will be two variations of the C300. Again the ordering guides tend to change rather often so it's very possible that more models will become available.
The Full Ordering Guide can be found Here