What if there were copies of normal maps modified for pvp?
For instance there could be a copy of the Metrica map with all the waypoints being positions to capture and defend.
Players enter the map as part of one of 2 fractions, red or blue and you can port to all waypoints captured by your fraction but not to a waypoint that is held be the other fraction.
You can enter as a solo player and become part of one of the fractions randomly, or you enter as part of a team, then all are in the same fraction.
Perhaps it would even be possible to enter as a guild so that guilds could fight against each other?