Hearthstone patch adds new deck slots and hero cards

Blizzard has confirmed all of the new features and fixes coming to Hearthstone in the latest patch, which is available for download.
Players will now have access to a total of 18 deck slots by unlocking all nine Hearthstone Heroes.
A new feature called “Deck Recipes” has also been added, which should help beginners get started with a variety of pre-built decks.
“Each classic recipe consists of only Basic and Classic cards, and provides a good foundation for you to get started on building most traditional decks.”
“Newer players will find that the classic recipe is a great tool to get familiar with the deck-building process, but they can also serve as a handy shortcut for veteran players looking to get a new deck started.”
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The Whispers of the Old Gods pack is now available to pre-purchase from the in-game shop. If you order now you will immediately receive a special edition card.
Blizzard has also announced that Hearthstone hit 40 million players at the end of 2015, and continues to grow with the release of new content.
source: press release