Hearthstone will be expanding beyond its initial selection of nine playable characters. However, you'll need to pay for these new Heroes.
The first new Hero Blizzard plans to add is Magni Bronzebeard, the dwarven king of Ironforge. He doesn't have any unique cards or a distinct Hero power. Instead, he's a Warrior like Garrosh Hellscream.
"Aside from the vibrant new Hero portrait artwork, these new Heroes also come with unique Hero power animations," Blizzard said. "Magni’s version of the Warrior’s 'Armor Up!' Hero Power is sure to reinforce the fact that his majesty is not to be trifled with!"
"New Heroes also come with unique emotes and voices that convey their individual personalities, a play area featuring a custom visual theme, and nifty “entering the game” animations so you can greet (or intimidate) your next opponent in style."
You'll have to pay $10 to unlock Magni Bronzebeard for your collection. He also comes with an exclusive red and black card back:
Blizzard plans to add other heroes in the future. I'd imagine they'll release at least one for each of the nine classes. They've got plenty of potential characters to use from the Warcraft universe. For example, they could use Garona Halforcen or Mathias Shaw for the Rogue class.
Heroes are the latest type of microtransaction Blizzard has added to Hearthstone. Since launch, players have been able to spend real-world money on card packs and entry passes for Arena Mode. Blizzard later added single-player adventures Curse of Naxxramas and Blackrock Mountain.
All of these items could also be purchased with gold, the in-game currency earned by playing matches. These Heroes are the first content that are only available for cash. I imagine the introduction of cash-only items would disappoint some players but fortunately this approach only applies to something like new Heroes that don't actually impact gameplay.
Hearthstone was released on smartphones this Spring. It's also available on tablets, PC and Mac.