Hearthstone: Heroes of Warcraft's next patch is sure to be an unpopular one. The update will weaken several cards in the game including Defender of Argus and Pyroblast.
Blizzard says that the following nerfs will go live in the next patch:
"It should depend on your playstyle and be flexible, rather than a must-have, which limits creativity and deck diversity," said community manager Zeriyah about card selection on Twitter.
If these nerfs have ruined your deck, you'll be able to rework your collection at a discount. Once the patch goes live, all Expert cards receiving nerfs can be disenchanted for their full cost. This higher yield will only last a limited amount of time, though. If the ice mage nerfs were any indication, you'll have two weeks to disenchant your unwanted cards.
Not all of the changes in the update are nerfs, though. Unleash the Hounds' mana cost has been reduced from 4 to 2. That should make the card much more appealing to Hunters in future matches.
This upcoming patch is focused solely on balance. Blizzard does intend to fix bugs like overlapping cards and floating minions. However, they're waiting until the patch after this one to push out those changes.
Blizzard says that this will be the last major balance patch before the game goes into open beta. Once open beta begins, they plan to make very few changes to cards' strength. The developers also don't plan to wipe player accounts anymore so your card collection will stay intact.
The second season of Hearthstone's beta launched last week. Blizzard hasn't announced when open testing will begin.