In the first post he wrote:
Still on set in Detroit filming Transformers 3.. Doing a bunch of scenes with my guy Shia today.. Fun times in the D!!This was shortly followed by a link to above picture:
Just finished an action scene.. Check out my view!! http://twitpic.com/2msnrjYesterday, Bay was spotted at the location so I think we can unofficially call today the first day of shooting in the city of Detroit for Transformers 3. I think the plan is for about a two week shoot do not really know how long it is supposed to go or all the locations they may use.