It's not about making them have human skin tones, it's about making them look more like vampires than rotting zombies.
If you notice, the nude patch folders for undead are labled "Scourge", which I guess to mean that at one point Blizzard was going to make the undead be a part of the Scourge, but decided to split them off into the Forsaken after the art had alreeady been completed.
Given that the Forsaken are not fully dead - they still eat (Cannibalize or regular), need to breathe (slow breath bar, but still have one), are healed by bandaging as well as holy energy, etc. it seems they still have a metabolism of sorts. They should look like humans that are extremely pale and emaciated, but they should not have all the flesh missing from their bones at the joints.
Now I am doubting it'll ever get done, unless Blizzard releases an expansion that updates the graphics like the Luclin one did for EQ, but it would be nice for the Forsaken to look the way they should instead of like members of the Scourge.
Edited, Tue Aug 16 08:57:22 2005 by Keovar