An uneven number of flags is placed over the map (I think 5 would be enough), and everyteam starts with a certain amount of control points. In this mode you can spawn several times.
The devs already made it possible that the equipment menu always pops up when the round is over, so they can also make a "spawn menu" pop up every time you are about to spawn.
You can spawn at every flag your team controls. If your team controls the majority of all flags, the enemy starts losing control points. The bigger the difference between the controlled flags, the faster you lose control points. If your points go to 0 or you don't have any flags and players left on the field, you lose. If you have no flags on the field, you can't spawn, and you have to hope that the teammates who are still alive will capture a flag for you.
This mode is less about skill and killing, it's about clever tactics. But I bet with the average cRPG-lemming-player it will be incredibly frustrating to play