Similar to the introduction of the latest Courtyard addition, testing arenas could be used in 1-2 week increments to show ideas and gather feedback on things that are being built and progressed (such as new game-modes, maps, mechanics)
If skyhammer is any indication, using only your internal testers feedback can have some backlash, and not have the desired effect. A test server that simply demonstrates new additions can go a long way into building new and more exciting pvp experiences.
Or just a PTS….but that has been pitched for ages.
Zietlogik [Warrior] Chronologix [Ranger] Ziet The Dreaded [Necromancer] Zietlogic [Revenant]