Hearthstone players learned the title of the game's first expansion, Goblins vs. Gnomes. Probably because it was a month ago. That expansion is launching on December 8th, adding 120 new cards into the card pool and displaying an alacrity that other Blizzard titles could only dream of achieving. The new expansion cards can be crafted, purchased, or earned via the Arena, just like the existing packs except with new cards.
If you're interested in having a launch party, Blizzard is also interested in your launch party. If you plan your event, have it registered as a proper gathering by notifying the community team, and then submit pictures and stories about the event by December 22nd, you could win a little Hearthstone care package. Or you could just kick back and enjoy the new expansion by playing. Your call.