At launch, we are currently planning to have three kinds of servers.
PvE
PvE (or player-versus-environment) servers focus largely on players fighting against computer-controlled monsters and characters, with PvP limited to areas set aside expressly for that purpose.
PvP
PvP (or player-versus-player) servers have more widespread PvP rulesets, encouraging players to fight against each other.
PvP-RP
These are PvP servers with extra rules of conduct to encourage roleplaying and a more “in-character” feel in-game.
This may change as we continue the Beta process and receive feedback from our testers and fans.