The new armor Tony Stark will be using in Iron Man 3 debuted on the floor this morning at the San Diego Comic-Con. The images included with this post, from tthe folks at Cinema Blend, shows the suit in all its golden glory. Although it has yet to be confirmed, a piece of concept art that circulated prior to this reveal hinted that the Iron Man Model 30 Extremis Armor would be used in the film.
Head over to the Cinema Blend post for a full gallery showing the suit from multiple angles.

