Lead designer Ben Brode will make the announcement tonight at 11pm Pacific / 2am Eastern on Blizzard’s official Twitch channel.
Earlier this week, Blizzard teased a “special Hearthstone announcement” during this week’s ChinaJoy event.
While nothing has been confirmed, Blizzard’s language promising “an unforgettable adventure” stemming from tonight’s event indicate plans to announce Hearthstone’s next single-player Adventure content.