Recently, I've found myself playing World of Warcraft more and more. It's all because of my new shadow priest I finished leveling on Horde side. Even more specifically, it's because of the new 5-man heroics in patch 4.3. There's nothing I like more than fresh content.
The first of the three new 5-man instances is called End Time. It's got a great concept: You travel forward in time to a post-apocalyptic Dragonblight nightmarescape. In this (soon-to-be) false future, Deathwing was not stopped and the maddened Echos of faction leaders roam a destroyed world. With treasure. As a level 85 shadow priest, it's your duty to travel to End Time, beat up the baddies, steal their loot, and ignore all the terrible time paradoxes your action undoubtably causes.
There are five different bosses in End Time. Your party will randomly face two of four different Echoes (Baine, Jaina, Sylvanas, Tyrande). After beating the first two bosses, your party will teleport to the Bronze Dragonshrine to face off against the dragon Murozond in what is arguably the most fun 5-man fight of the entire expansion.