I have been trying to get into Transformers for a while now, but the movies don't make it very easy. I've only seen the first and fourth one, though. This movie, however, may be a good fresh start.
Right now, the only two things I care about in that trailer is Bumblebee and Starscream, namely because they were my two favorites before.
Bumblebee looks... interesting... I don't dislike the new look, and the fact that he actually still looks like a Volkswagen in robot form is pretty cool, but the proportions seem a little off. I'll probably get used to it, or I just looked at it the wrong way, but that's my opinion.
Starscream looks cool, I hope they don't go for the weird-looking triangle-shape body like in the show and the movies, but I wouldn't hate it if they did.
I'm kind of excited for this movie. It isn't quite Boba Fett or Avengers 4, but as long as they don't have both Galvatron and Lockdown, that's a plus! Transformers 4 jokes aside, I have high hopes from this.