Roberto Orci has revealed some further information about Transformers: Revenge of the Fallen on our 2005 Boards
. He states that some of the leaked TFW insider information may be misinformation. Specifically, he states that Soundwave is not a pick up truck, although he doesn't rule out Soundwave being a truck of some kind.
On the subject of misinformation, Roberto mentions that the false information generally has not been working very well, in fact he says it usually does not work.
In other postings, he stated that the "Fallen" in the title may be a robot, or just a synonym for the defeated side. We can also look forward to fights like the Freeway Brawl in the first movie between Optimus Prime and Bonecrusher, only longer this time around. There's also a good chance we might see a Decepticon who is ridiculously loyal to Megatron and the Decepticon cause. Just don't expect it to be Tidal Wave - Roberto Orci, Alex Kurtzman and the other writers just could not fund a way to make him work in the sequel's story.