More news coming out of BlizzCon 2010… Diablo 3 is going to feature an arena stystem for PvP, in which players can duel or challenge each other in team play. Right now it looks like arena teams will be capped at 4 players each.
Rather than reintroduce a game world where players can flag themselves and go grief other players, Blizzard has elected to incorporate a system in which players can willfully engage in PvP play.
Due to class imbalance issues, the emphasis will be on team play, but 1 on 1 competitions will still be available. The Diablo 3 PvP arena system will have a progression based ranking system, award titles, provide vanity rewards and also feature achievements.