If you are sensitive to spoilers, stop reading now. A while back, it looked like Transformers 4 would film on the USS Bramble, a retired Coast Guard ship that sits in Marine City, Michigan. Michael Bay has decided to pass on the location probably due to him finding another place that is more suitable or cheaper. The owner of the ship did gave away some details as to what the ship would be used for though. He said that the look Michael Bay was searching for was a dark, Russian waterfront. The scene filmed there would've been people searching for the Autobots.
In other news, filming dates for Chicago have been finalized. The Transformers 4 crew will be filming there from August 18th through September 27th.
Sources: Hispanic Business, The Times Herald