Hearthstone is getting yet another expansion and it comes out this August. It's called Knights of the Frozen Throne and it brings players to the icy Northrend, with the expansion themed after the Death Knights of Warcraft lore.
Blizzard is introducing a new card type for Knights of the Frozen Throne called Hero Cards. There will be nine Hero Cards in this expansion and what it does is it replaces your deck's hero with a Death Knight version of itself, granting the player a Battlecry effect once you cast it and a new Hero Power to use once it replaces your hero.
The new keyword coming to this expansion will be Lifesteal. Keywords are effects that are attached to Hearthstone cards, and this one, in particular, will heal your hero if that card manages to do damage, be it a spell or a creature.
Knights of the Frozen Throne will expand the online card game with 135 new cards and it will also come with a series of missions that pits players against Warcraft characters such as Professor Putricide, Sindragosa, and Lich King himself in boss-like battles similar to Hearthstone's Adventure pack content. The missions that will come with the expansion will be free for all players. Finishing the prologue mission grants players a random legendary Death Knight Hero Card for free. So, think of it as an introduction to the expansion's theme as we'd like to think new decks will revolve around the new card type.
Pre-purchasing is now available for Knights of the Frozen Throne, a 50-pack bundle is available and will cost you $50. Just like previous expansion releases, this is only available once per account. If you invest as early as now, you will be given a unique card back.
Hearthstone's Arena Mode, which allows you draft cards and makes a deck with what was chosen by you, can be played to earn Knights of the Frozen Throne packs.
The last expansion called Journey to Un'Goro, was released on April 6 and also introduced the card type called Quests and the keyword Adapt into Hearthstone. Knights of the Frozen Throne is planned for release in early August for PC, Android, and iOS. No specific date was given at this time.