Though it's only launching on Mac and PC today, Blizzard has promised iPhone and iPad versions of the game as well.
The Hearthstone beta is complete and we wanted to take a moment to thank all of our participants for their incredibly valuable feedback and support. If you haven’t had the chance to jump into the game, now is the perfect time to check out the fast-paced strategy card game that’s fun for everyone. If you’re new to Hearthstone, getting started is simple: Just visit playhearthstone.com and click on the “Play Free Now” button. Once your download is finished, fire it up and click on the Hearthstone icon. Install Hearthstone, then hit the “Play” button and you’ll be on your way.
As soon as you jump in you’ll challenge iconic Warcraft characters, including the ferocious Hogger, the mischievous Millhouse Manastorm, and the wise Lorewalker Cho. As you progress through these introductory missions, you’ll hone your card-slinging skills in preparation for a climactic battle against Illidan Stormrage! You are not prepared . . . for this much fun!
System requirements are fairly generous, requiring an Intel Core 2 Duo processor, although Blizzard recommends an Intel Core i3 or better, along with an NVIDIA GeForce GT 650M or ATI Radeon HD 5670 or better graphics card.
Hearthstone: Heroes of Warcraft is a free download from Blizzard's website.