So far there has been only Wintergrasp which is supposed to be a PVP zone but really it is a epic fail and unbalanced during the match and usually empty outside of the match or the rare occasion when you catch someone they can just leave the zone in the middle of the fight.
I think Blizzard needs to take a step back in time and for example take the idea of Gurubashi Arena apply those rules to Wintergrasp or some new pvp zone make the elementals loot actually worth fighting for or even the fortress could constantly be a battlezone where every 30 minutes the raid/team that holds it longest gets a nice fat ammount of honor.
I also think Alliance/Horde should be able to group up inside of this zone to fix the balance of getting outnumbered.
Its an idea id love to see in the game it would take PVP to the next level.
Thanks for reading i look forward to constructive input.