We are looking at restricting chat to 'Team only' in all PvP settings. We have not decided exactly what we will do, let alone when it will be published but: we are thinking no chat between enemy combatants (ever), and players would be able to chat with team members - but only after they have chosen a team and are officially 'on' that team (i.e. you can't chat before the match starts and you can't talk trash on the results screen).