The Brewfest event is current up for testing on the PTR. Some quick notes:

• There will be two purchasable mounts this time
  • A Kodo for Horde players only
  • A Ram for Alliance players only
• There is a event-only boss, named Coren Direbrew (pic below). He is located in the Grim Guzzler inside Blackrock Depths. Instead of having to clear all the way to the tavern every time, Blizzard has installed a teleporter that will whisk you on down there. This time around, you get to fight him!
  His drops:
  • [Coren's Lucky Coin]
  • [Dark Iron Smoking Pipe]
  • [Direbrew Hops]
  • [Empty Mug of Direbrew]
  • [Direbrew's Shanker]
  • [Brightbrew Charm]
  • [Balebrew Charm]