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