Of all of the pickup concepts shown, to my eye the Nukizer is by far the best both in looks and in execution. As built, Dynapro axles, ARB's, Atlas II T-case, 38 inch tires, what else could you want in an off-road capable device? The build list looks remarkably like the build list on the car I built to race in the Outback. The exception is the diesel engine, which I don't especially like for off road use except for plonking along trails. With nothing more than a modest Ford V-8, I have outperformed all sorts of diesels, NA and turbo both, when driving aggressively. All the grunt in the world won't get you up the hill if you can not also turn the tires at a relatively high rate when needed.
I like the Cummins in my Dodge Ram 2500. It will pull a 17,000 pound GVW combo right down the interstate and get 14mpg doing it. To get that kind of power, however, you have to accommodate one of the longest straight 6 motors going, not to mention that the motor weighs half as much as a VW Bug. The problem I have with small displacement diesel is that it simply does not do as much work as a small block V-8, and for off road use, fuel economy is not my first consideration.
So, put the Hemi V-8 in the Nukizer, find a different name ( I get the "New Kaiser" part, but most folks won't -- my '68 CJ-5 is a Kaiser, most think it is a Willys, and when I point out it was built by Kaiser, they say "Huh? Never heard of it.") The problem Jeep has with any of these concepts is that once built they have to sell them globally, and as there are any number of highly successful off road capable utility vehicles on the planet built better than anything offered by Jeep, I suspect Jeep won't be able to capture enough market share to warrant the cost, which I suspect is what has held them back all these years.
As far as one comment posted above about Jeep being able to build such concepts basically off the shelf but we can't buy them, I would suggest that isn't true. They built one, so can you. Problem is that you would spend about as much as they did, and they have way deeper pockets. My CJ-7 cost me $50K ready to race, and it is not as well put together as the Nukizer to be frank. I would hate to guess what it cost to build that vehicle, and therein lies the reason you and I would have trouble building one. If you can put a V-10 Viper engine in a TJ, the sky is the limit on what can be built -- if you have the cash.
I just think that the Nukizer concept vehicle is really sharp, and was built with some of the best parts out there. Obviously Jeep can build off road vehicles when it puts its mind to it.