UPDATE 17/7/14 9.15AMThe Plague Quarter, The Curse of Naxxramas' second wing of content, is now available to download in Europe.
Contained within it are three more bosses to defeat - Noth, Heigan and Loatheb. Beat them to unlock three new cards (Stoneskin Gargoyle, Unstable Ghoul, Sludge Belcher) and a new legendary card (Loatheb himself).
Three more wings are set to launch over the next three Wednesdays - pricing details lie below.
ORIGINAL STORY 17/7/14 6.30PM Hearthstone's single-player campaign, Curse of Naxxramas, is arriving on PC, Mac and iOS Tuesday, 22nd July, Blizzard has announced.
The expansion will be released in five chapters distributed on a weekly basis. The opening episode, Arachnid Quarter, will be free for the first month.
Curse of Naxxramas' pricing scheme varies depending on whether you buy certain chapters in bundles or a la carte, but assuming you snag Arachnid Quarter for free, you can purchase the rest in a bundle for Ł13.99 / €17.99 / $19.99 or 2800 gold. You can also mix and match currencies if you want to use some in-game gold and some real world money.
The first expansion for Hearthstone is live now. Take a look through our Naxxramas strategy guide if you're struggling.