It does get confusing when the same name is used for different bikes.
The original Thorn Nomad was a derailleur bike and was more akin to the present day Sherpa. This went through a number of iterations; initially with quill stem, then with A-head stem and then I believe with a change of tubing from 531 to 725.
The bike you are referring to is the Thorn Raven Nomad which as the Raven part denotes is designed around the Rohloff hub. This is on its second iteration, the first being designed around a standard fork and the second being designed to allow changeability with a suspension fork.
Hope this is roughly right and sheds some light on it
Andy