New patch came out yesterday:
Hearthstone Patch Notes - 4.2.0.12051 - News - Hearthstone
Quote:
Build Highlights:
New alternate Paladin Hero: Lady Liadrin. She will be obtainable from an upcoming World of Warcraft promotion. We've got her backstory, hero music, and voiceover dialogue. You can get her right now by hitting Level 20 in WoW: Fledgling Hero of Warcraft.
New Tavern Brawl Cards including Annoy-o-Tron Fanclub, Annoy-o-Tron Prime, City of Stormwind, and Nefarian. We also have new Tavern Brawl images, including a face-off between Kel'Thuzad and Rafaam.
New card backs Overwatch, Eyes of C'Thun, Hogger. The Overwatch card back is available when you log in.
9 Additional Deck Slots are in, as well as Deck Recipes and improved searching!
Whispers of the Old Gods can be preordered today, March 14.
With Lady Liadrin as the 13th hero, there are references in the game to a Hero 14 that we're currently looking into.
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Also new paladin hero:
You do need to level a char to 20 though. Had a char sitting at 15 so it wasn't too bad haha. It's not retroactive unfortunately.