This is a new suggestion for a warzone game based on rate of kills, which would work for large groups of players (assuming no FPS issues in the future).
Other games have somewhat used this concept. In Rock Band, when you successfully hit the right notes you fill an energy meter which allows you to deploy overdrive.
How would this work? Imagine a full operation group of 24 players against another one of 24 players. When your group kills someone from the other group, your "energy meter" increases, as well when someone from your group dies, it decreases. The winner is the group which fills this energy meter.
This system puts the groups focused in killing as many as possible and trying to avoid as many deaths as possible, which would be a new approach different from the traditional arenas.
Depending on how large this energy meter pool is, and if the teams are equally matched, you can have a game lasting for hours (anyone who played old-school Alterac Valley miss that..). You can have a system that gives valor points during the match, so the player is still rewarded if he has to leave.
Bioware can pull something out of this concept easily. Since big stadium fights are part of Star Wars lore (Geonosis Battle, for example), BW can create a Hutt game in a stadium that your energy meter is the Team A crowd cheering vs Team B crowd cheering. Another possible mechanism to implement is the ability to summon elite droids (or even a champion one) to help during the fight.