"Like the similar Chevrolet Silverado, the Sierra will get a major redo for 2019 with an aluminum-intensive body to save weight, which the Ford F-150 has already adopted. But the GMs will sport styling much like that of the current models, including an innovative running board that seems to also incorporate a step up into the bed.
"A turbocharged V-6 is also said to be available with the new generation of GM trucks, as is a diesel V-6. The 10-speed automatic already seen in the Chevrolet Camaro ZL1 should replace the current eight-speed unit in many, if not all, versions of the Sierra. A brake-by-wire system will also debut on the Sierra, and an air suspension such as the one on the Ram 1500s may also be offered on the Sierra for the first time."
These are a lot of big changes that will make this extremely competitive AND it'll come with a diesel. The competition is real and it's gonna be interesting. I'll have to take a look at both of them at this point and see where my liking flings towards.