You read that right. In honor of WoW's 5-year anniversary, in the upcoming Patch 3.2.2, Onyxia will make her triumphant return to the world of Azeroth!
The patch will convert Onyxia's Lair to a 10- and 25-player dungeon, along with new items whose models match the old-school gear available in the vanilla instance, like Tier 2 helms. Additional rewards include a 310% speed flying mount modeled after Onyxia herself!
As a bonus, anyone who logs in during the 5-year anniversary event in November will get an Onyxia Whelpling pet.