Hearthstone: Whispers of the Old Gods announced as latest expansion

Blizzard reveals new Hearthstone cards including C'Thun, a 'legendary' that interacts with 16 other new cards, in major expansion that changes format of game

The next expansion pack for Hearthstone, Blizzard's hugely popular collectible card video game, will be called Whispers of the Old Gods and will launch towards the end of April or the beginning of May, the company has announced.

Based around Warcraft's Lovecraftian-style elder gods, C'Thun, Yogg-Saron, N'Zoth and Y'Shaarj, the expansion will bring a further 144 cards to the game, including a number of "corrupted" versions of previous minions. A selection of the new cards were revealed to journalists and community members at Blizzard's headquarters in Los Angeles on Tuesday.