We've just received this shot of a completely uncamoed 2011 GMC Sierra 3500 dually sporting a brand-new hood that features reverse-powerdome styling with prominent center-mounted louvers. There is an embossed "Duramax 6.6-liter" on the louver sides, along with the logo for the Duramax's six-speed Allison transmission. We've also seen a lightly disguised Sierra 2500HD out and about, showing off its new three-bar perforated grille that shares styling with the 2010 GMC Terrain midsize crossover. The Sierra HD, along with its GM corporate twin, the Chevrolet Silverado 2500/3500HD, will also feature an all-new chassis and a next-generation 6.6-liter "LML" Duramax V-8 clean diesel engine.

What else might GM have up its sleeve? We hear from our sources that GM is working on a large-displacement (approximately 7.0 liters) direct-injection gas engine that would produce lots of power but with a much lower pricetag than the Duramax diesel. The new D.I. gas engine could arrive by 2013. There may also be plans for a Denali version, to go head to head with Ford's topline King Ranch Super Duty, with a unique four-bar chrome perforated grille and chrome trim, door handles, and wheels.

Check out the full photo in our March/April 2010 issue of Truck Trend Magazine when it hits news stands on Janury 26th, 2010.