It’s not a monster at all, it’s GEDDY LEE from the band Rush. Check out http://geddyleeisslusho.blogspot.com/ for obvious proof that this is the monster they are keeping so secret.
Look here he is throwing the statue of liberty’s head!
obviously its a joke, I figured with all the serious talk about the movie and posters I’d throw in a little humor. The site is very well made/thought out, check out the pictures of Geddy compared to the 1-18-08.com pictures, genius!