Just noticed that the Mammoth face plates have changed from the ones on the Live servers, not sure when it occurred though. They actually have holes in the mask so they can see. Sorry about the links, cant post them properly yet.
img715.imageshack.us/ img715/2667/mammoth3.jpg <- Original faces
img715.imageshack.us/ img715/8677/mammoth2.jpg <- Model in Beta
img715.imageshack.us/ img715/3721/mammoth1.jpg <- Model in Beta
Sorry if this has been posted, but I searched and found nothing.