The front and rear are still under camouflage, but a few details can be made out. The front air dam has been significantly enlarged, presumably to feed cool air to those two reputed turbos. At the rear, you can glimpse the quad exhaust outlets integrated into the diffuser. The trunk also appears to be hiding a tiny lip spoiler. The ride height also seems somewhat lower than stock, as would be expected for an AMG model. Otherwise, there aren't many changes on the outside – at least not yet.
There are still some lingering questions about the Mercedes' upcoming model. For example, we don't know if the C63 name is staying or if the smaller engine will force a change. The sport sedan is expected to be revealed by the early portion of 2015, but its official debut date and location remains unknown.