New casting calls for Transformers 3 have provided the start date for production and small details about the movie. Principle photography for Transformers 3 is scheduled to run from May 1st (or 17th), 2010 to July 1st, 2010. So far seen both numbers for start date but same end date. The shooting locations are now listed as Chicago, Detroit, Washington DC, Florida, Texas, Africa, Moscow and China. The casting calls found on Chicago Craigslist (thanks to Tyler for link) and Acting Auditions are showing a search for extras and principle actors (speaking lines).
For Chicago, "Joan Philo Casting (A Nightmare on Elm St., The Dark Knight) is searching for Ukrainian/Eastern European (looking) men (20 to 60 years of age) to work as paid extras on a feature film in April. This will be a one-day shoot. ...Especially looking for Ukrainian (Or Ukrainian looking types) men 6' to 6'3", clothing size 42 regular to 50 regular who know how to handle a gun. If you have a bigger build and are of a larger size – we love this!" Maybe something involving soldiers is going to occur in a Ukraine town.
The extras call in Los Angeles is seeking "Men, 66+, ethnically ambiguous, weathered, tattered, frail, featured roles." This sounds like a polite description of a bum. As for the principle actors, no specifics on what they are looking for is provided, just an address to send photo and resume to DW Studio Productions, LLC.
To summarize, casting for Transformers 3 is in full swing. Pre-shoots start next week or so in Chicago and Gary, Indiana. Principle photography starts in May. Some scenes possibly involve Ukrainian soldiers, Ukrainian townspeople, and maybe bums.