I finally watched the vid that Mooseman linked to - and I have to say, I failed to give GM a bit of credit they deserved.
I personally wouldn't get the 4-cylinder, but I can see it being a *somewhat* viable option now, given the specs / engineering (just watch the video, and save me from a page of typing...LOL)
The V6 and V8s are going to be geared toward volume / fleet, from what I see.
That diesel with the 10AT looks like the real sweet spot. You have to go LT and up to get it, but I think that'd be the one to go for. And it has idle-cutoff as well (all of them do), which should really help w/ fuel economy (and no AFM!) One can be a pretty efficient driver if they don't have take the 0 mpg hit while idling in traffic. And when you need the TQ / power, it's there (even more so when it gets a turbo).
I was very surprised to see the 6.2L as an option for the high dollar trims. I shudder to see the price tag on a fully-optioned High Country - maybe close to $70K ? For a 1/2-ton pickup? That has a bow tie in the grille?
I *still* don't like the truck in side profile, though. Maybe it'll grow on me.