We’ve seen a few of these guys around in the background.  The bottom sketches were my very first attempts at getting them on to paper.  The centaur-wolf wasn’t a bad idea per se, but it wasn’t at all what I had been imagining.  I ended up ditching the concept until I remembered that they weren’t the only six-legged race I had designed.  I went back to my demon and sphinx designs and studied the placement of the arms there, and attempted to translate that into a wolf design.  Those were the middle sketches, and the top sketches were me working out movement and clothing/armor.  There are also a few attempts at badge designs for their military service, and some logos, which we may not actually be seeing in the comic.