The goal behind this rig was to enable as much flexibility as possibility in an intuitive way. The video below shows the Fable 3 production rig demoing some of these features.
Scalable upper/lower limbs
Elbow & Knee pinning
Knuckle & finger tip pivot
The rig was scripted into a Rigging Framework called ACT (which was written by a previous TA) and used for all bipedal characters within Fable 3.