Hearthstone’s Whispers of the Old Gods expansion is all about engagement in a $1.2B market

Hearthstone: Heroes of Warcraft is about to get an injection of new cards … and tentacles. Lots of tentacles. Whispers of the Old Gods is the collectible card game’s third expansion, Blizzard Entertainment revealed today, and players should get their dances with the H.P. Lovecraft-inspired devils toward the end of April or the beginning of May. […]