When I first read the press release, I assumed it would be like many of the AWD systems that live in many modern CUVs. They are FWD 99% of the time and have a clutch system that can send some power (usually less than 50%) to the rear axle when the front slips. They only engage at low speeds (less than 5-10 mph). I think of it as a LSD front to back but not side to side. They help on snow/ice to get you started, but really don't help in the dirt as this is not what they are targeted at.
Based on the pictures, it looks like this is an add on unit to the RWD system. My guess is the system activates some sort of clutch or break system if it detects the front wheels are spinning slower than the rear. If the system just puts the breaks on the rear axle to push power to the front, it will not perform well for anything but a quick jolt to get a stopped van moving on a slick surface; and wont help much for anything else. However, if it has a van has a true mechanical center clutch system that can decide what percentage of power to push where, and the rear has some sort of traction device (truck locker highly preferred but even LSD would help a lot), and the transmission has some really low gears, it could be good enough to not need a true low range system and perform quite well considering the platform and small tires. Here's to hoping!