Looks like the next Hearthstone adventure is set in WOW's Karazhan

[Administrator]

Hearthstone's next adventure will be revealed on 28th July, an invitation sent to press by Blizzard suggests.
More to the point, the invite appears to hint at the adventure's setting: classic World of Wacraft dungeon Karazhan.
Blizzard's mailout hints at magic and mystery, includes feathers and mention of an "old friend".
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