According to a very reliable source, promotional efforts for Transformers: Revenge of the Fallen are about to begin in earnest.
Here's what director Michael Bay wrote in his most recent blog entry:
First there will be a teaser poster soon after the new year, and the teaser trailer will be out either in the theaters early Feb. or on the Superbowl. Cannot decide yet. I'm going to release some set stills on this site in a few weeks. I'll keep you informed. Going back to do more selects now from my portable avid that I take home from work. It's late, see you.