The Hearthstone team just sent out an invite to an event that will be streamed on July 28th, and with it presumably the announcement for the next adventure mode (especially considering the invite literally says they have an unforgettable adventure planned). We have our thoughts that Karazhan will be announced and it looks like a week from Thursday we’ll find out if we’re correct.
The event will be streamed at http://twitch.tv/playhearthstone on July 28th at 11:00 PM PDT. The email we received said it’s coming to ChinaJoy so might be the reason for the late time frame. Yes, it says PM and not AM.