My understanding is that there's a single, adjustable truss rod and two fixed graphite rods. Presumably the latter will prevent any kind of lateral bending or twisting, which was one of the advantages of having two, separately adjustable truss rods. The single rod can still compensate for fore and aft distortions. I don't know but I'd suspect that the graphite rods are constructed so that their combined thickness across the fingerboard is greater than their depth from fingerboard to back of neck (as would be the case if they each had a square cross section). This would give them more flex fore and aft (thus allowing the truss rod to work) and less flex side-to-side (thus giving that lateral stability). Ultimately, only time will tell, but this seems like a pretty good strategy on its face. I'd love to take one for a spin.
