have announced that the second part of the Flame & Frost update is now live continuing the Living Story event, which sees more refugees leaving the Shiverpeaks to escape the battle. With this update you can join your fellow guild members to take on an entirely new category of content. The Guild Missions, designed for coordinated group play, include everything from bounties to group puzzles to cross-country challenges.
In addition, the update introduces a new type of competitive PvP: two teams of equal average rating are pitted against each other in a quick, intense match. The ratings for every member of each team is then adjusted after the match.
Full details are located here