One thing that allows players to step up against people of much greater power in the arena is the ability to tinker with formations and setups. I can beat players 1/4 stronger than I am (2-3mil power) in the arena that I have trouble beating in the wild or in revenge. I'll be curious to see how this works out in the multi elimination tourney, where we get opportunities to tweak, but not experiment.

Also, I remain curious about how they'll work with the imbalance that someone on server 1 has compared to someone on 91. Will there be a handicap of some sort? Power ups a la WB/Rag/HP?

Execution will be everything.