Cheyenne is supposed to spawn the next gen Silverado SS. These pictures are from last September mind you but the fact that a mule exists coupled with the Cheyennes appearance at SEMA is a fairly good indicator this thing is in heavy dev. RAM is also working on the 1500 R/T and Ford has the Tremor.
"We caught what appears to be a Chevy Silverado SS prototype out on a test run in Michigan. This particular Silverado was riding on 275/55R20 Goodyear Eagle LS-2 rubber — identical to the tire size and brand choice found on earlier Silverado SS models. Add to that what appear to be classic Chevy SS five-spoke 20-inch wheels, and this prototype has some important cues that could well point to a more performance-oriented street truck in GM's new-truck pipeline.
yea Chevy said at SEMA that the Cheyenne was the one model they brought there to pay attention to. Considering an SS silverado would be nothing more than short box, reg cab with a LARGE engine dev time is non existent.