Chills started with the frequencies during the opening credits. Trailers didn't even give a glimpse of the action in the movie. You won't be disappointed by thinking you saw it all.
A lot more "hand to hand" action sequences and A TON more robots (although not all are formerly introduced).
The robot forms are not as detailed in some shots (Tran1 you would see all the close up inner workings of transormations very drawn out/precise movements). This one doesn't focus on the details like that, but more on the action. This allowed for more robots and longer action sequences.
You still won't be disappointed, and it is a great story of the origins.
I will definately be seeing this several more times.