Shockwave

Shockwave is the main Villain in Transformers 3. Not much is known about him, but rumors persist that the story will circle over a plot in which he controls cybertron, just like in the G1 series, and that Megatron wants to take over that power. Maybe the plot will struggle over the command for Cybertron? Not much is known, but a cardboard face cut-out of Shockwave was seen at the Chicago filming, of which is the climax of the film. Below is a link to the picture of his face and concept arts of his face (Option 4 is most likely). Also, Shockwave is most likely to interact with Soundwave in an unknown way because in War for Cybertron, Shockwave had ordered around Soundwave to play "The Touch". This is obviously not a high chance of happening, but the 2 might be 'important' characters in the film.

Transformers 3

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Shockwave is seen on set near a half-over turned car in which Sam and Carly are hiding behind.

Links:

http://www.comicbookmovie.com/fansites/UnForgottenHero/news/?a=20244

http://studio-pandorabox.com/blog/wp-content/uploads/2009/07/shockwave-by-pamonh-sisouk-wip-concept001.jpg