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Introduced as 2007 models, the current Chevrolet Silverado and GMC Sierra full-size pickup twins are due for a revamp. Our spy photographers (dressed like snow leopards, we hope) have nabbed several shots of both extended- and crew-cab versions during cold-weather testing. While it’s difficult to make out much in the way of design aside from the familiar cab-in-front, bed-in-back layout, here’s a rundown of what changes to anticipate.

Keep Reading: 2014 Chevrolet Silverado / GMC Sierra Spy Photos – Future Cars