The new title was revealed by producer Don Murphy on his message forum.
Director Michael Bay informed MTV that the sequel will not end on a cliffhanger.
He said: "You know how those sequels they do the second one so you go see the third one? [Transformers 2] is it. First one was just introducing, setting up stuff, so we can go a lot further. Let's just say [this] is not a lame sequel."
Shia LaBeouf, Megan Fox, Josh Duhamel, Tyrese Gibson and John Turturro will star in the sequel, along with franchise newcomers Isabel Lucas, Rainn Wilson and Matthew Marsden.
Transformers 2: Revenge Of The Fallen is scheduled for release on June 26, 2009.