That teaser looks like ass. I must be the only person that is unimpressed with those special effects. I remember all of the talk surrounding the first Transformers and the effects. I thought they were good, but nothing groundbreaking. I hope that this one gives us some wide shots of the transformer battles. It possed me off that we only got to see tight shots of the transformers while they were fighting.
I thought it was cool, hope the movie is better than the first one.
Also, the trialer has been posted here already.
http://www.killermovies.com/forums/showthread.php?s=&postid=11545370#post11545370