Posted on tfw2005, by someone verifying the recent TF2 posters by the official material that came with it, this could well be the plot premise to the sequel, as it fits with the bits so far leaked relating to the Egyptian theme.

The guy that owns the comic store gets comic book movie posters to put out for upcoming movies...it says TF2-Fallen on the side of the box and says do not display till Feb.... NOW the Fallen could be talking about the movie title right?Well we are getting 2 other movie posters in Feb on our order sheet with TF2-Prime and TF2-JFire as the poster id's...also the TF2-Fallen display came with a id card that said something like this "The Fallen was one of the 1st Transformers that came to earth to enslave after being outcasted by his rulers he was hailed as a god but later was enslaved in a Egyptian pyramid and lies asleep UNDER the pyramid waiting till it's time to get his revenge"
http://www.tfw2005.com/transformers-...fallen-166573/

If that info is true, I think movie critics could end up focussing on its similarities to Stargate, instead of any 'originality' that a sequel hopes to at least acheive from its first movie. It's bad enough that it could just be viewed as 'another robot violence movie', it is also likely to be viewed as a copy-cat plot idea.