It's called ATT-ATT, and it stands for "All the toys, all the time." That basically sums up how Bay likes to shoot his films. When approaching a particular scene, the director prefers to have all different types of film equipment ready to go if inspiration strikes at any particular moment.
It takes a reveal visionary to destroy the city of Chicago as thoroughly as Bay crushed it in "Dark of the Moon," and the crew attributes a lot of that look to ATT-ATT. The behind the scene featurette comes from the upcoming Blu-ray release of the third "Transformers" film on January 31, and in it we get to see Bay at work.
In the clip, we see Bay explaining exactly where he wants the mechanical carnage to take place and how he wants it all to look. That can mean changing where destroyed cars sit on the streets of Chicago or how a car looks after it backs up into a piece of construction equipment.
Leave it to Shia LaBeouf to put it best. "This the way the man works," he said. "And the reason his movies look the way they do is because he works that way."