User blog comment:Jkphantom9/My gosh, Volume 2 isn't out yet.../@comment-3257939-20140707233149

I seriously doubt the mech fight will be the final fight of this volume. Why you ask? Simple:

It's very unlikely that Monty already animated the final episode and aired it on the trailer.

While is possible that the fight itself hasn't been entirely animated and Monty made only those parts to show them in the trailer. What about the other fights? Why would Monty spoil the final fight instead of using others. The mech fight in the city and the freeway was the entire action of the trailer. It would be a waste to show them in the trailer to later reveal them as the final fight.