There are different planets on Zone that act as different game modes.
Iricia is a snowy planet with two teams: Sweep Fleet and Storm Troopers. The teams fight for five bases spread across the map.
Zone Wars is like Star Wars theme light vs dark where you have to destroy the other side's power generator.
Guild Wars is a team death match.
Alpha is simply a killing map. you can join one of the three Alpha map teams or go solo.
Spar is self-explanatory.
Koth is a team king of the hill map. Four teams, but only two were open on PC.
Wildcross is a solo death match, where the winner gets a nice big statue after each match and tons of money, exp, and bounty.
Bunker is a planet where there are two teams that start with no weapons, and you have to explore to collect weapons to take bases that reduce the other team's score (like Dominion on League of Legends).
Platform/Event Planet is a platform (gravity) planet where two teams just slaughter each other until the planet closes and everyone is kicked.
There's a CTF map, and I don't remember the name of the planet.
But it had hidden bunkers and stuff. It was pretty neat.
Not sure how many of them will be kept though. <_<