If the V6 is rated at 15 mpg city, that is abysmal by today's standards. For a small business (or a large one) buying a cheap regular cab truck to run errands around town, Ford and Dodge...er, Ram...both beat that and either would be a better choice.
Styling... we can laugh about how it looks like the previous generation (it does), but they took no chances and the GM loyal will warm right up to it. The rectangular wheel wells are ugly and hated by many. Not sure why they kept them. Probably because it was just too costly to change.
Interior... very bland, very plain... again, it takes no chances. But with Ford's beautiful Limited and Harley edition interiors, and the Ram Laramie Limited and Long Horn, clearly GM remains at the bottom of the list for "style". Well, that is unless you count the Nissan Titan...but honestly, who does anymore?
This overall blandness and lack of any significant advancement combined with the glut of remaining 2012's threatens to make this launch a real debacle for GM, and a costly one at that.
Where did you see any info on gas mileage? The next gen 4.3 has nothing to do with the current one, I would expect the gas mileage to rival the Pentastar, maybe even better because of the MDS. Keep in mind 8 speeds are in the future as well, plus the current GM 6 speed is geared a lot better than the 6 speed in my '12 Ram.
The only thing that sticks out to me is the aerodynamics. They say they improved it but it's shaped like a brick. Check out the side profile of these trucks versus a side profile of the Ram. The Ram looks like it will cut through the air a lot better than these new GM twins.
All in all, despite my Mopar bias, I do like them. Very tough looking, very bold. Reminds me of the late 70's to late 80's GM trucks which is a good thing in my opinion. I also like the interior based on the pictures, it's simple and clean, the gauge cluster is very nice looking. Good competition benefits us all with a better end product. I can't wait to see what Chrysler does with the next gen Hemi. DI or Multiair? Should be exciting!