Beta is over and launch has officially arrived. Hearthstone: Heroes of Warcraft shed its beta skin today for its official launch with a brand new update loaded with new rewards, arid graphics, and balance tweaks. Blizzard is also giving players a chance to earn a free Hearthstone mount for their World of Warcraft account.
"The Hearthsteed mount reward has been added and can now be obtained for your World of Warcraft account! Win 3 games in Play or Arena mode to acquire one of your own!"
You can read the official launch patch notes for the full rundown.
Source: Hearthstone Launch Announcement