Blizzard announced the first expansion as part of the Year of the Raven today, and it's called "The Witchwood." The new expansion comes with several new cards, along with a host of new card abilities all based around a gothic-horror theme.
"Dark magic has twisted the creatures of the forest and set them loose upon the Gilnean capital in Azeroth," writes Blizzard in a press release. Witchwood is set for a mid-April release with new keywords such as: "Echo" and "Rush," along with a new Dungeon Run-style mode called Monster Hunt.
Echo is an ability that lets players use a card with that particular keyword as many time as they want in a single turn. So if you have a 3-cost Echo card and 9 mana, you can summon that card three times in a turn if you choose.
Another keyword this expansion is called Rush, and it's basically like Charge except it's only limited to other minions. Meaning when you play a Rush card, you can attack with it immediately, but your targets can only be minions. Blizzard says that this is because these cards would be too powerful if they were given Charge, but with Rush are better balanced.
Monster Hunt is the new, free Dungeon Run-like mode introduced with Witchwood. Like Dungeon Run, Monster Hunt features unique cards not included in regular Hearthstone play. This time, there are also four unique heroes that players can choose from as well. You can choose from either the Cannoneer, Houndmaster, Time Tinkerer, or Tracker.
The new expansion is the start of the new Year of the Raven season for Hearthstone following the end of the Year of the Mammoth and its Kobolds and Catacombs expansion. The set is expected to release mid-April and players can pre-purchase a pack of 50 cards for the next expansion.