Thats exactly it Chris, I hadn't seen that before (or I'm old and forgetful) but thats exactly what I was thinking. A very nice setup. The coil overs and mogs are a bit flash too! Who's Discos are those?
Clubagreenie, the advantage of that front setup. The radius arms generate roll resistance. Articulation is generated by the axle bushes ability to deform. That setup removes the 2 bushes on the end of each radius arm (replacing it with a link that has 1 axle bush) and the axle is prevented from rotating through the new upper link. It allows more and freer articulation.

