I'm taking this all with a grain of salt, but according to the fine gentlemen over at Winding Road, pictured before you is a test mule for Mercedes forthcoming Audi R8-slayer, dubbed the SLC.  If the rumors are to be believed, the SLC (which will be built by the German company HWA) is set to be powered by AMG's 6.2-Liter V8, and will be based on the next-generation SL platform.  As a result, a front-engine design is expected along with a non-retractable carbon fiber roof.

At this point, this all speculation, especially considering the next-generation SL isn't scheduled to hit until 2010.  As for when we'll learn more, the SLC concept (if that's even the correct name) will supposedly occur at next year's Geneva Motor Show.  We will of course keep you posted if we hear anything new; in the meantime, head over to Winding Road to check out the full SLC gallery.