WoW's Warlords of Draenor expansion extends the game's universe and fiction. Returning to the series' traditional dynamic of Alliance vs Horde, you must fight the evil Iron Horde of Orcs across the alien land of Draenor.
Along with the standard rebalance, level cap increase (up to 100), and notable visual upgrade, the most exciting element of Draenor is the ability to build your own castle. That's right; WoW has final added housing.
This is a substantial update for, perhaps, the only relevant MMO.