While a Detroit shoot still has not been confirmed, it seems Reel Chicago has been able to verify that Michael Bay and his crew is heading to Chicago once again for Transformers 4.  According to the site,  "Neither the production schedule nor cast has been completed, although Chicago location scouts have been hired and the L.A. production staff is expected to land here en masse in June and reportedly will shoot from July through October."  Back in January Mark Wahlberg had slipped and said he was house hunting in the area for a four month rental.  Bay had previously filmed in Chicago for Transformers: Dark of the Moon and had nothing but praise for the city. Thanks to Wynton R. for the link.