OK, I've received more info on the Quad Dual Beam system: Yes, it is two H13 bulbs per side, each wired up to be active on low and high beam. This does not run afoul of FMVSS 108, which states (in S10.15.1): "A replaceable bulb headlighting system (...) must provide in total not more than two upper beams and two lower beams and must incorporate not more than two replaceable light sources in each headlamp." Note that it refers to beams, not to compartments, and to light sources, not lit light sources. So the Ford Quad Dual Beam system uses two H13 bulbs on each side to provide the low beams and the high beams. Perhaps one of the compartments provides the hot spot (distance throw) while the other one provides spread/width. Or perhaps they both provide more or less a complete beam, but the two of them together provide a stronger beam. It will be interesting to see how the task is split up: if I lose one of my H13s, do I lose my distance reach or my spread/foreground on that side, or do I still have a complete beam, just not as strong of a beam? Have to wait and see.
I'm sure this is a better-performing headlamp system than the outgoing setups with single H13 or something like H11 low/HB3 high. But yee dogs, 120w per side on low beam and 140w per side on high beam (@ 12.8v) for a total of 240w low beam and 280w high beam? Not that there's going to be any shortage of power available in a truck like that, which I'm sure comes equipped with a monster alternator, but wow, that's a whole lot of amps (about 20 of them) to achieve the task.