Rollbar

(Note: This character is non-canon). Autobot Rollbar (Only Vehicle image available) was supposed to be one of the newest Autobots on the team, transforming into a customized Jeep Wrangler. Unfortunately, Nelson Lauren has confirmed that Rollbar will NOT be in the movie. Nelson stated:

"It's actually not Rollbar or a Transformer to begin with. This jeep has nothing to do with the TF3 production as of this moment. A dedicated fan decided to try his luck at having his jeep featured in TF3. It was a publicity stunt on behalf of the owner in which 'reportedly' some set people fell for it. It never made it into the set. Have you seen images of it being taken off the flatbed and getting prepped? No."

The last statement is true. But this could always be a part of their famous "misinformation campaign'. So in truth, Rollbar will not be a character in Transformers 3.