Who is the 'blue guy'?

Okay everybody. Maybe I'm really dense or something, but who is this 'blue guy' everybody keeps referring to? I've read about him in multiple threads, and every time I see it, my mind keeps conjuring up images of the Blue Man Group. Is this the the mysterious bald dude next to the SJ chair in all the trailers? If so, he doesn't look very Smurf-colored to me. More like Captain Picard on crack, or Shinzon from ST: Nemesis. Anybody care to elaborate?