Legendary's Thomas Tull has just premiered some footage from World of Warcraft at Comic-Con. It was a scene, depicting a fight between a human and an Orc in the barrens. Patrick Dane identified a few of the very Warcraft-y details – the Alliance Sigil on a shield, for one thing, and some other bits of build and design.
The CG-created orc clearly couldn't be identified, but if the human was anybody we would have heard of, I don't know who he was.
There's no casting info but Duncan Jones just came out and promised that production will start in 2014.