Have someone read Nefarious issue 04 ?? At the end of the comic you see the head of a decepticon, maybe he is shockwave or straxus ?? Here is the link to the mysterious decepticon. http://i25.tinypic.com/rr32no.jpg
He looks like some freaky insect. Actually, it's a really generic head, to be honest. Could be anyone or anything.
Would they really put a design of a movie character in the comics before they officially release it themselves for promotional purposes and whatnot? Wasn't that what happened with Soundwave? I think I remember that when they put him in the comics before ROTF he had no detail and was very vague. I don't think this is a TF3 character (or how they'd appear in the movies) and I highly doubt this is Shockwave...for one thing too many eyes.