First and foremost, don't hold yer breath for a production version of the Mighty FC at your local Jeep dealer, ain't never gonna happen.
Like the J-12 concept, the Mighty FC is built on a Wrangler chassis. So, yes, it has solid axles front and rear as well as JK-based suspension. We speculate that the Mighty FC will have the factory Wrangler Pentastar V-6 and automatic transmission. This will likely be done to work with the tight space constraints and to simplify control linkage issues. Remember, the seats will be nearly on top of the engine. Your feet will be at the grille.
It appears that the Mighty FC will have a bed similar to the '57-'65 FC-150 or longer FC-170. The original FC-150 featured an 81-inch wheelbase. The FC-170 had a wheelbase of 103.5 inches. At this point we're not sure if the Mighty FC is based on the two-door Wrangler chassis (95.4-inch wheelbase), the longer four-door Wrangler Unlimited chassis (116-inch wheelbase), or something in between. However, we think the right thing to do would be to have built it on the shorter two-door frame. We also would not be surprised to find a ballast weight at the rear bumper to keep the Mighty FC from nosing over down the steep hills of Moab. A little-known fact is that the FC-150s had a 150-pound cast iron weight bolted the the rear of the frame, just behind the bumper, to keep the Jeep from nosing over.