It appears we now have most of the pertinent data on the Nissan Cummins, with the exception of price.
A little number crunching (and a dose of reality) will probably show the Nissan Cummins will inevitably be priced very similar to the Big 3 3/4 - 1 ton diesels. IMO, no magical $5k-$10k discount is gonna appear to help it sell against the Big 3, big-bore diesels.
Some want to make a direct connection between price and tow/haul capability. If something has less tow/haul capability it should cost less.
Fortunately, or unfortunately, depending on your perspective, market forces are driven by a dizzying and confusing combination of features/specs such as MPG, payload, tow capacity, luxury, styling, gas, diesel, torque, and/or price.
For example, the Ecodiesel. Even though it has low towing capacity, the lowest payload, and is selling with MSRP's as high as many 3/4 - 1 ton diesels . . . it's still a big success . . . all because there is a market segment that places a higher priority on MPG, diesel, and luxury, relative to the other features/specs.
The Nissan Cummins has the advantage of a unique combination of features/specs: diesel, 24 MPG, 550 ft. lbs. of torque, 2k payload, and 12k towing. Yes, there are trucks that may beat this truck handily in one or two categories, but there are no other trucks with this unique combination of "mid-range" numbers. IMO, this in itself places this truck in an excellent position to potentially do well, even with an MSRP as high as the Big 3, big-bore diesels.
For now it looks good on paper. Yup, time will tell.