We seem to finally be getting some more information on the production of Transformers: Revenge of the Fallen, with news from the Transformers Live Action Movie Blog that the filming production crew have already returned to Edwards Air Force Base in California to reshoot some scenes. They arrived on 19th November and filmed for a week. No other confirmed details are known about what was done.
There’s also nothing official about the news of the first trailer. They mention that they are “90% sure” that the trailer will be packaged with the upcoming remake, The Day The Earth Stood Still, which arrives in North America on 12th December.