Horde warchief Garrosh Hellscream is in the midst of a rampage, unimaginable by both hero and Horde alike. World of Warcraft's new 5.4 patch, the Siege of Orgrimmar, follows Hellscream's dangerous quest for power, while also introducing a challenging new area and new Flexible Raiding, to help increase accessibility.
The new Flexible Raid feature takes specific group sizes (anywhere from 10-25 players) into account and adjusts quest difficulty accordingly. Flexible raid difficulty will range between raid finder and normal difficulty, with no item level or role requirements. For example, if you have a group of 11, there's no need to leave an odd man out.
More traditional groups may be more interested in the new Siege of Orgrimmar raid, which will contain four wings and 14 bosses, consisting of Hellscream's new Horde. The raid is meant to for max-level players and will conclude with groups taking the fight directly to Garrosh Hellscream, himself, over the Ragefire Chasm.
The full patch notes are available here and you can also check out the Siege of Orgrimmar trailer below, so you can see for yourself just how dire the situation in Azeroth has become.