Hearthstone's next big expansion, Kobolds and Catacombs, arrives next Friday, 8th December.
Along with 135 new cards, Blizzard is stuffing the expansion with free single-player content which anyone can access for free (the fun-looking Choose Your Own Adventure-like Dungeon Run mode).
There are new card mechanics, too: Recruit, to pull a minion from your deck; Spellstones, which are spells that increase in power as you play; Unidentified Items with semi-randomised effects; and the first Legendary weapons.
Log in from next Friday and you'll get one of those Legendary weapons and three new card packs for free. You can then also play Dungeon Run and unlock three more packs.
Or if you want to reserve a satchel of card packs in advance, you can pay Ł44.99 to grab 50 at a discount, along with an exclusive card back.