Hidden in Highmountain is a Drogbar cave in an area called 'Greystone', with an extremely deep pit. Down in this pit is an NPC named Brick, whom you can see on the left. He's surrounded by crystals that negate falling damage, and encourages you to jump the rest of the way down into the pit, which is littered with powerful 110 elites, is a PvP free-for-all zone, and contains loads of battleground buffs and LoS shrouds. The only way out is to die.
Pretty neat area, thought I'd share. Perhaps Blizzard has plans.