https://www.polygon.com/2018/3/12/17111176/hearthstone-witchwood-cards-expansion-release-date-blizzard

Today, Blizzard announced the newest expansion for Hearthstone: The Witchwood. Themed around the haunted city of Gilneas, players will be able to acquire 135 brand new cards in order to fight off the spirits of the Witchwood.

“Dark magic has twisted the creatures of the forest and set them loose upon the Gilnean capital in Azeroth, but King Genn Greymane and his lycanthropic subjects won’t make for easy prey,” Blizzard said in an announcement. “The citizens of this proud kingdom, who can shapeshift into ferocious wolf-beasts known as worgen, are bringing the fight to The Witchwood with tooth and claw—and soon, Hearthstone players will join the pack and help them face down the horrors within.”