Blizzard's official Twitch channel, PlayHearthstone, will host a special event on April 21 at 10am PDT.

The event was on Blizzard's website earlier today. It will feature Lead Game Designer Ben Brode, and well known Hearthstone tournament caster, , unveiling new cards from Whispers of the Old Gods. There will also be a series of show matches.With strong strong of an April 26 release date for the set, it seems possible that the remainder of the unspoiled cards for the set will be shown either on the stream, or released immediately after it.