Hearthstone is, well, kind of popular. So it's a bit of a surprise that it took as long as it did for the first expansion to roll out. Still, Goblins vs Gnomes is a welcome sight all the same.
The expansion centers around the titular groups of diminutive tinkerers, and it adds (what else?) a fair number of new cards - including the brand new "Mech" minion type, which can apparently be quite powerful when you use several of them together. These new cards are available to draft in the Arena, or you can buy them in packs from the shop. A new appropriately-themed board is also available, and Spectator Mode is finally up and running for those times when you'd rather study other players' techniques instead of watching your Murlocks get squashed (for a change).
The Goblins vs Gnomes expansion is live now, and you can download Hearthstone for free whenever you feel like checking it out. And we both know you feel like checking it out.