It turns out that Transformers: Revenge of the Fallen may have a new ARG (alternate reality game) marketing campaign just like they did with Sector 7 for the first movie. As site reader Mauri noted, if you watch the new trailer, at the 1:08 point, you will notice that Sam has a jacket on and along the back it says "www.therealeffingdeal.com" (left pic). If you go to that site you are then asked for login credentials.
So I did a search to see if any Transfans found the username and password. No luck but the guys over at TFW2005.com did discover another Easter Egg in the trailer, a code (right pic, circled) that gives you access to Stormbringer, a gold character in Battle of the AllSpark game. No idea how they decoded it but it becomes 091784 or 09/17/84 the day that the original Transformers cartoon debuted.
I checked the first trailer and didn't spot anything but then I didn't notice anything in the second trailer either. Hopefully more clues and fun will come out as we reach June 24th.