I have a feeling we're going to see a lot more 2.55-paced battles in 4.0, if the Stormblood "Revolutions" cinematic is anything to go on. I had to watch it again and again, and each time it just got better and better. I'm seriously stoked for what's coming--especially Raubahn and son fighting alongside each other.
With how 3.56 ended, I feel like anything could happen in the story at this point. Maybe even another Calamity! :D