http://www.tfw2005.com/boards/transformers-movie-discussion/300896-tf3-pre-shooting-has-begun-chicago-pics-d.html Also, they did some pre-vis shooting at Gary, Indiana last week.
I hope they'll still be public with their shooting. I liked seeing all of those camcordre shots of them filming car scenes and stuff getting a look at the new vehicles.
From what I understand they will begin shooting in Chicago in May. I do not have a specific date, yet.