There are some images floating around, that I had seen originally on facebook, but I am not sure where they originated at this point. Its hard to say where these come from now with the codex getting accidentally released now, and the information inside widely dispersed.
Here are a couple links
http://www.warseer.com/forums/showthread.php?394043-Ork-Rumours-MorK-II/page105
The facebook page doesnt not seem to be working properly, so I have removed it. As with any early picture, the first time we see these they tend to be much less impressive than seeing the model in person or on a GW release video.
