The SLC cometh. Mr. H. Lehmann and crew caught an early development mule out testing, and word is that the car will likely get its grunt from a front-mounted 6.2-liter V8 provided by AMG. In natural guise it would put out 500 bhp, but with a few blowers that could easily be "remedied" to 700 or so.
The SLC will be focused more on sport than luxury, and though based on the next-gen SL and sharing many of it parts, it will use carbon fiber throughout, including its hard top. We'll have to see what kind of weight specs (and body) are eventually revealed, but you're looking at Merc's main competitor for Audi's upcoming RS8.
[Source: Winding Road]