Hound will be making his live action debut. Purists will notice that he isn't a jeep but I don't particularity care. The IDW comics have been playing fast and loose with vehicle modes so I don't mind.
A mystery bot. It could be a new bot entirely, but from the blue paint color and the fact that it's a sports car, it's been speculated that it could possibly be Blur.
Bumblebee sporting a vintage look.
And Optomus Prime's new look. I personally don't care for it, but then again in Prime they go super radical change up, so again, it's not really that big a deal for me.