Interesting, but it's not really enough information to speculate on anything. I can't really get anything out of the image since it's just blurred pixels.
The first thing that comes to mind when I see "ironhorde" is maybe a faction of Orcs loyal to Garrosh who want to continue the "RAWR KILL ALL ALLIANCE SCUM AND DRINK THEIR BLOOD RAWR" stuff he was doing and possibly play a minor part in the next expansion, but it could really mean any number of things.
Or it could just be a random doodad temp name that devs pulled out of their asses. :P