This is a digital collectible trading card game and the mobile versions will be released sometime in the second half of next year:
Chief creative officer Rob Pardo said the touch-controlled version of the game for tablets is a great way to play the game, but “not everyone actually has tablets.” On stage, Pardo showed a shot of the game running on an iPhone 5s.
The game was already announced for iPad, Mac and Windows PC. That version of the game is expected to go into an open beta next month, Pardo said, “but in Blizzard language, that might mean January.”
BlizzCon attendees will be treated to an exclusive Hearthstone card, Pardo announced, a gold card variant of the Elite Tauren Chieftan. When played, the ETC appears to boost the attacks of other cards already played with “power chords” giving other players “the power to ROCK!” Playing the card causes concert stage lighting and pyrotechnic effects on the playfield.
Blizzard revealed Hearthstone: Heroes of Warcraft at a PAX East 2013 panel. The free-to-play collectible card game entered a closed beta for Mac and PC in August.
Official Source: http://www.youtube.com/watch?v=QdXl3QtutQI