http://www.pcgamer.c...ure-this-april/
http://us.battle.net...krock-mountain/
Trouble stirs beneath Blackrock Mountain. Deep within the fiery cracks of the Molten Core, Ragnaros the Firelord is massing his elemental forces, posing a serious threat to the black dragon Nefarian’s mountaintop lair. Things are about to reach a flashpoint… better break out the cards and show these two how real heroes settle their differences: with a civilized game of Hearthstone!
Blackrock Mountain throws you right in the middle of one of Azeroth’s most heated conflicts, the ancient feud between the elemental lord of fire, Ragnaros, and the powerful black dragon Nefarian, the de-facto leader of the black dragonflight. Nefarian would call himself the ruler of Blackrock Mountain, but Ragnaros and his elemental servants have been a thorn in the dragon’s side for far too long. This mountain’s not big enough for the two of them. Before you do the dragon’s bidding to take on the Firelord, ask yourself: Is Nefarian’s encouragement genuine, or are you just another pawn in the old wyrm’s schemes?
Fight your way through five wings full of epic bosses and add their exclusive cards to your collection, defeat clever class challenges to earn even more new class cards, then take on Heroic Mode to prove once and for all who is the true master of Blackrock Mountain.
Ready your deck. Watch your mana. Conserve health. And never, EVER, cut a deal with a dragon.
Sweeeeeet 
Also, to coincide with its release, you can play for this awesome card back for the month of March:
