Update: The Hearthstone Twitter account has reaffirmed that Android and iPhone versions of Hearthstone are in the works and planned for later this year.
Original story: Blizzard teased us with a Canadian release a few weeks ago, but now Hearthstone on iPad is available for the rest of North America. This joins the recent news of the Curse of Naxxramas expansion, which is set to hit PC and iPad simultaneously.
Blizzard announced that any progress made on the PC version will transfer over to the iPad, and by giving it a try you'll get a pack of cards once you complete the tutorials and a single play or arena session.
Pick it up on the App Store now.