Things we know!
1) Sam is in college and Mikella Meets him there and from that point they get stuck back into the war of the bots
2) Sam's parents are also involved and in danger
3) Sam knows something about the decipticons that makes them come after him
4) Megs is ressurected from the dead in a new form
5) Starscream has been in charge of the cons since the last movie
6) It's one year later
7) Scorpinok isn't dead

9) new autobots include skids, mudflap, sideswipe, three motorcycles that might combine to form arcee
10) new cons include 7 constructicons including demolisher and long haul who combine to form devestator (how they are getting around the tank named devestator in the first movie is a mystery), sideways, soundwave, and ravage
11) the fallen is a character who was one of the original 13 transformers and more than likely dug up in Egypt and he wants revenge for something
12) optimus prime fights with demolisher in japan/china
13) sideways fights with the three motorcycles in japan/china
14) optimus gets his face smashed
15) some big boats get sunk by protoforms
16) protoforms land in egypt
17) there's a stupid pretender that looks like a hot chick
... what else am i missing... and lets start putting the puzzle together