Last week's release of the Plague Quarter was notable for two reasons. The more obvious and unintended one was the hiccups on launch that lasted well into the second day of its release. The other was that it marked the first time that Blizzard asked for money for anything besides Arena and packs of cards within Hearthstone. However it seems to have paid off for them.
According to the statistics last week was Hearthstone's most popular on record, with loads of people logging in to play cards against the likes of the Plague Quarter bosses and take on its Class Challenges too. This bodes well for the future of any other planned expansions Blizzard might have had in the drawing up stages for Hearthstone's future.
“The fact that last week was our strongest week ever for Hearthstone in terms of both revenue and engagement, I think, is a really strong sign,” Blizzard CEO Mike Morhaime. “I think that it really bodes very well for the engagement that we’ll be able to drive in the future with additional content for the game,”