The Hearthstone website reveals that Blizzard's card-based strategy game is currently down for maintenance, and is expected to come back online at 11:00 am EDT (give or take eight hours, judging by history). Though the Curse of Naxxramas expansion is expected to go live today, another post clarifies that this maintenance will not conclude with the launch of the add-on, which will follow at some point later today. To keep players occupied in the meantime, the Hearthstone Facebook page shows off the cards in Curse of Naxxramas.