Blizzcon opened with a bang with Ben Brode taking the stage and revealing the next expansion for Hearthstone [Free], Kobolds & Catacombs. We already knew a few tiny snippets about it, like the single player vaguely roguelike dungeon crawl mode, but in the main Hearthstone panel, loads more details and cards were discussed.
First off, all nine classes are getting legendary weapons and each of these are said to have their own flavor with unique powers that reflect the theme of each of the classes. For instance, the legendary weapon Aluneth draws three cards each turn players have it equipped. It seems like the entire meta is going to revolve around weapon destruction like Acidic Swamp Ooze.

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Continuing with the theme of discovering treasures is unidentified item cards. These cards will have a persistent base effect and an RNG component which varies a bit each time you draw them. The card revealed showing this in action is Unidentified Elixir which always gives a minion +2/+2, along with another random effect. (You can see all the varieties below in the card dump below.)
Oh, and Spellstones which were only teased earlier got a lot more detail revealed. Basically, each class now has a spell which "levels up" as the game goes on. They initially start in their 'lesser' form and by completing mini-objectives (like gaining armor and a variety of other stuff) they get more powerful. It's a bit like quests, but with ind...