The moment you've been waiting for is here, Hearthstone: Heroes of Warcraft open beta has begun
! You can head over to the official Blizzard site
right now, download a copy to your Battle.net account, along with the Battle.net launcher if you don't have it already, and start playing right this very second!
WoW Insider has countless guides and tidbits of information about Hearthstone available for your perusal, so do have a look around
while it's downloading to ready yourself for battle!
Do note that while this is US-only for now, other regions' open betas will be going live in the next few days