GM is coming up with their all new 1500 truck line up. The most important upgrades are the engines. The 5.3l V8, as powerful and capable as it is, now it is the most fuel efficient V8 truck. GM released EPA fuel economy estimate of 23 mpg Highway. That is the same as the 3.6l V6 Ram 4WD. I believe GM released 2WD numbers but that is still impressive. The interior and exterior are redesigned and Sierra looks damn tough!! Not much have been released, so we have to wait for full specs.
For GMC sierra performance data and specs: GMC Sierra 0-60