Blizzard has said that the next Hearthstone expansion will be called Blackrock Mountain and will be released in April.
The single player expansion will follow the pattern laid down by the first expansion, Curse of Naxxramas, in releasing a new ‘wing' week-by-week. Unlike Naxxrama, however, the first wing will not be free with each costing either 700 in-game gold or $6.99. All five can be bought for $24.99, with a special card back given to those who pre-order.
Seventeen bosses will feature across the new content offering a total of 31 new cards available to be unlocked by beating the bosses and class-specific challenges. Legendry cards will be awarded for clearing each wing.
Five of those have already been detailed, and it looks like Blizzard o giving a helping hand to those tired of falling victim to aggro Hunter decks. There's also a focus on dragon synergy
Blizzard has also shown off the first screens of its smartphone version, which will be released within the next couple of months”.
Here's some screens, via GameSpot: