Found this over at GMI, while I knew about the TB SS, I hadn't heard of Colorado SS before, but it appears to be old news.
Concept Vehicle Highlights
In the hallowed tradition of SS-badged Chevrolets such as the Chevelle, Camaro, and awesome 1990-93 454 SS Sport Truck, the Colorado SS show vehicle sets a new benchmark for road-going performance. The Colorado SS launches with 400 horsepower from the 2005 Corvette’s LS2 and then benefits from a complete package of high-performance features.
LS2 6.0L V-8 with 400 horsepower and 400 lb.-ft. torque that exhales through a custom-built performance exhaust from the catalyst rearward
Heavy-duty 4L70-E four-speed automatic transmission with floor shifter
Heavy-duty 9.5-inch rear axle with a locking differential for added traction and a short 3.73:1 rear axle ratio for rapid acceleration
Front disc brakes measuring over 12 inches that are sourced from the full-size Chevrolet Silverado; rear disc brakes from the Chevrolet TrailBlazer.
Lowered suspension riding on brushed nickel-plated 20-inch Silverado SS rims
Stylized interior with unique trim, bezels, and seats
Custom exterior package with unique grille, fascias, flares, rocker extensions and tonneau cover