It's expected that the truck will have more visual deviation from the Chevrolet Silverado than the current truck does. It's also expected that the truck will have the same 3-bar grille that the 2011 GMC Sierra HD trucks--set to be unveiled next month--will have. Styling cues may be taken from the GMC Granite Concept, according to the story, and the truck may get active aerodynamics.
The next Sierra, which is due to arrive for 2013, will likely get more direct-injection powertrain options, a larger gasoline V-8, and a hybrid system that will offer better towing capacity. The next Sierra (along with the next Chevrolet Silverado) will have all-new frames, and heavy-duty versions will likely wear similar sheetmetal.
2013 is a long way away, or so it seems, but considering that there are already 2011 models plying the streets, it stands to reason that we may see the next-generation of GM's full-size pickups sooner than we think.
We should caution that the design posted on PickupTrucks.com is an independent artist's rendering, and he's basing it on spy shots and design cues from other GM vehicles, like the Granite. That said, there's a good chance that he's more right than wrong about the design, although we expect it will be toned-down and less aggressive in production form, since that's the norm in the industry.
We'll know sooner rather than later.