You can add Austin, Texas area to the list of locations that Transformers 4 will be shooting this summer. According to Dallas News (via Seibertron), sometime in June the production will be in the small towns of Lockhart, Taylor, Elgin and Pfugnerville. In Taylor the plan is to close downtown and a railroad overpass with a car explosion set for Robinson Park. For Lockhart, the Caldwell County Courthouse will be used. The cities are part of a chase between the Autobots and Decepticons through Central Texas. Filming is expected to start in June (location unknown) with production hitting Detroit, Chicago, Hong Kong, and other unknown locations in China.
Speaking of Chicago, Bay was spotted scouting locations in the city on April 25th. Locations he and his crew checked out include LaSalle Street near Randolph Street up to the Board of Trade Building. Not sure what can gleam from that story wise but mostly reinforces that TF4 is coming soon to the area. Thanks to Wynton R. for the links.