Check out this image:
In MOO1, the Darloks were “shape-shifters”, but definitely had a non-corporeal vibe to them. This is probably because they were originally patterned after the Nazgul in Lord of the Rings.
In MOO2, Darloks became strictly biological and developed a less-mysterious look which they have retained through the latest MOO (althoughwith far superior artwork in MOO4). To the right is the MOO2 version of Darloks.
In all versions of MOO, the Darloks are master spies and considered very secretive. Anyway, Remnants is a MOO1 clone and will return the Darloks to their non-corporeal status.
The current plan is to cast the Darloks as refugees from a parallel dimension, escaping to ours and forming a new “homeworld” at Nazin. They are very secretive about their extra-dimensional nature and origin. Perhaps they fear being ostracized as aliens in the truest sense of the word, or perhaps the other races will learn about and open portals to their dimension. Obviously, Jeff (the writer) will flesh this out in very interesting ways.
Either way, it has to be more interesting than the standard one-dimensional caricature of the “dark shadowy Darloks”.