So far shown only as a coupe, the 2012 Mercedes-Benz C 63 AMG Black Series is one vicious yet surprisingly compliant factory special; we know, as we recently spent a day thrashing one around Laguna Seca (more to come on that soon). Now, however, the boffins at AMG appear to be working on an Estate, or wagon, version of the ultimate C-Class.

That skips right over the sedan version, which is also likely being tested but has not yet been spied. Nevertheless, we're glad to see the wagon version in process, as it lends an extra degree of utility to what is already a brilliant car.

The C 63 AMG Black Series wagon is likely to share its specs with the coupe version, though it will certainly get unique suspension tuning and perhaps a few unique wagon-specific options. That means power output for the wagon should be right at 510 horsepower and 457 pound-feet of torque from the venerable 6.2-liter V-8 engine, good for 0-62 mph runs in the coupe of 4.2 seconds.

The AMG Speedshift MCT seven-speed clutched automatic transmission is also a shoo-in, as are the concomitant Race Start launch control mode, adjustable sport driving modes, and manual-mode paddle shifters.

We also expect the Track and Aerodynamics packages to be available on the wagon, though they may take slightly different form to better maximize performance of the wagon.

We'll keep our ears to the ground on the development progress, including any word of a coming sedan, but for now, feast your eyes on the wagon--and warm up those check books. The E 63 AMG wagon is coming to America, so there's at least a possibility the C 63 AMG Black Series might follow the same path, particularly if the very limited-volume coupe sells out quickly.