Blizzard has announced that the next Hearthstone expansion, Whispers of the Old Gods, will be arriving for all platforms on April 26th in North America and Europe and Asia on April 27th. Whispers brings 134 new cards into the game that are "totally not corrupted".
The Old Gods are benevolent (we cannot stress that enough) entities of supreme power who have come to show everyone just how much fun everything can be when you relax, and stop worrying so much! Some of your favorite adversaries and allies from the tavern have already met the Old Gods, and are much, much better for it!
Check out the full announcement on the Hearthstone site.