It's neat to get new footage - but this close to the movie's launch I'd expect a real trailer with some genuine 'why you should see this movie' type moments in it. Certainly there are some good moments in the trailer [EG frozen Megatron, Optimus just starting to transform, the portion of Blackout's transformation] but it feels like they're getting weighed down by the generic action scenes.
I wish the footage of the 'bot modes was clearer & longer - right now all they look like semi-amorphous walking piles of scrap metal. And it's kinda difficult to tell who's who when the 'bot is moving - but I'll allow that this could be something to do with these particular scenes, or still unfinished CGI work for these scenes. I wish the 'bot modes had more prominent faction badges - seems rather silly for them to be absent.
Unfortunately, I still don't see anything to alleviate my concerns about the end product. I want Transformers to be a great movie - I know Transformers can be adapted into a great movie - I'm just not yet seeing enough to convince me that this movie will truly be all it can [and deserves] to be. As foolish as it may be, I still hold onto a few vestiges of hope though: perhaps the real trailer will change my mind...