Promising "something for everyone" with Gauntlgrym, Cryptic will dare players to jump into the dungeon and pursue the Dwarf King's treasure. What's interesting about the instance is that not only does it offer both PvP and PvE modes as players fight for a faction, but actions taken or missed will affect each phase of the journey. Tier 2 rewards lie in wait for the winning team, although tier 1 rewards will be given to all teams that make it to the end.
The dungeon is for level 60 players who are in a guild, but that's the only qualification to enter; there is no gear score check for Gauntlgrym. We already saw the trailer a few days ago, but this article gives more concrete details about what to expect.