Today at Blizzcon, Blizzard announced the first expansion for their popular card game Hearthstone. It'll be called Goblins vs. Gnomes and will be out next month - it'll include 120 new cards, including an explosive sheep. Because, of course.

The game has already gotten one sorta-expansion called Curse of Naxxramas, though that was billed as an "adventure," rather than a pure expansion. Here's the trailer, straight outta Blizzcon: