Link: https://movies.yahoo.com/summer-movies/Transformers/1808716430/trailers/31
You can find it here. I took a few interesting shots from it. See below!
A good look at Optimus Prime's face
Interesting how he doesn't have the shield over his mouth. It also looks like Optimus has a goatee! WTF? 
Optimus Prime's Mouth Shield
There's been a lot of controversy about the apparent lack of a face shield over Optimus' mouth. In the original cartoons and comic books, it was always there. Up until now, you've never actually seen his face. Apparently, if you watch the preview closely, you'll see that he normally doesn't have the shield, but when he goes into battle, the shield expands out from the sides as you can see from the sequence of photos below.
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Megatron at a military base
Apparently the militar capture Megatron. Perhaps this is an injured, deactivated Megatron found early in the movie. 
Bumblebees face
Here we see a good shot of Bumblebees face. Notice the Autobot logo on his forehead 
b>Optimus in action
And last but not least, a great shot of Optimus in action! 