Below is a quick snapshot of the various candidate faces we have so far. The first is Jetfire who has a vertical lined "beard" that the poster face doesn't have. The second one is Soundwave, who comes pretty darn close except he has one eye and a "mouth" while the poster doesn't. However, the toys have to be "locked" nearly six months to a year ago to meet manufacturing deadlines while Michael Bay and company can make adjustments as they see fit. Also of note is how similar to the Decepticon logo the face is (something Soundwave shares). It’s possible that a story point, supported by
Update: At this point, I am going to assume the image in the poster is The Fallen until get evidence to the contrary. I could write out a long explanation but TheHDRoom already did it so why re-invent the wheel.