After Detroit, it is assumed that Florida is the next stop and Collect Space found a few articles that indicated possible locations for the shoot and confirmed that the shuttle launch of the Discovery on September 16th is part of the shoot.
From Central Florida News 13 (link now dead):
[Space Coast Film Commissioner Bonnie King] said location scouts have visited the area for two to three days at a time, looking at other areas to shoot. Those included Patrick Air Force Base; Space Coast Regional Airport, in Titusville; Merritt Island Airport; Lone Cabbage Fish Camp, in Cocoa; and a Cocoa Beach house. Scouts also checked out some swamps and went into the woods.WESH Orlando also provided a few specifics:
A shuttle launch pad, one of the crawler vehicles that move the space shuttle and the KSC Vehicle Assembly Building are expected to be depicted in the film, King said in a news release. [King] said the film crew will be working around the scheduled launch of space shuttle Discovery on Sept. 16.Update:As has been noted in the comments, the launch of Discovery has been moved to November 1st. However, the latest Shuttle News from NASA indicates that preparation continues with the shuttle being moved to the Vehicle Assembly Building to be joined to its two boosters and fuel tank. It seems that even if the launch itself cannot be filmed (even assuming a launch is part of the film), the shuttle itself will still provide opportunities for filming.
Bay is looking for an airport with a big hangar for the movie, which could bring him and the film's crew and stars to Patrick Air Force Base, Space Coast Regional Airport or Merritt Island Airport.
The location scouts also looked at scenes of local airboat rides, swamps and woods while they were in Brevard. Whether those scenes will be used depends on the developing plot twists for the film, King said in a news release.