Although I didn't have time to dissect all the systems during my hands-on, one of the most interesting features was the All-Out Attack. This is a universal overhead (meaning it will beat a crouching block) that can be followed-up by rapidly pressing both attacks for up to 15 hits. By quickly tapping one of the Persona buttons once the assault is finished, you can either launch the opponent into the air for an aerial combo opportunity or knock them backwards to build some space.
It's not uncommon to see a button mashing mechanic in a sophisticated fighting game, but if you want to get the maximum number of hits while forcing your opponent into a vulnerable state you have to use precise timing. You also have to think about EX specials, a universal Furious Action attack that trades health for start-up invincibility and an Instant Block that's reminiscent of Mark of the Wolves - in addition to Arena's own brand of Bursts. These can escape assaults, extend combos or instantly charge your super meter if hit raw, and unlike the more punishing nature of BlazBlue there's no penalty for Bursting.