Kobolds & Catacombs, the next expansion for Hearthstone: Heroes of Warcraft, now has a release date--and it's soon. Blizzard announced today that the expansion will arrive on December 7 in North America, with a release for Europe coming a day later.

As announced at BlizzCon, Kobolds & Catacombs comes with 135 new cards, including new card types such as Spellstones and Unidentified items. Also new in the expansion is the Dungeon Runs single-player mode, which Blizzard says contains 48 different encounters. Additionally, everyone gets a random legendary weapon card and three Kobolds & Catacombs card packs for free just for logging in.

Hearthstone is free but you can pay real money to add cards. For $50, you can get 50 Kobolds & Catacombs card packs, along with a "For the Hoard" card. This card is unlocked right away, should you decide to pre-order, but the Kobolds & Catacombs cards of course will not be available until the expansion arrives.

Kobolds & Catacombs is Hearthstone's fifth expansion, following Goblins vs. Gnomes, The Grand Tournament, Whispers of the Old Gods, Mean Streets of Gadgetzan, Journey to Un'Goro, and Knights of the Frozen Throne.