The Guild Hall: Will there be any "free-for-all" PvP maps where players can join in at any time and simply bash away at anything that moves?

ArenaNet: Guild Wars is a game of team-based strategy, and so careful planning…oh hell, sometimes you just want to load up your war hammer and go bash on something! Yes, we do intend to provide areas of the world where you can jump into competitive arenas and go after anything that moves. While we have not solidified the design of this aspect of the game, the goal will be to get you into a competitive arena as quickly as possible, bypassing the usual party formation and planning of more structured player-versus-player missions. We are still working on the numbers, mechanics, and rewards for this style of play, but if you’ve got 10 minutes before dinner and some pent-up aggression to burn off, you’ll be satisfied.