Straight from Blizzard themselves, the skinny on their first custom map for SCII, which is a resource-gathering map:
We’re proud to announce the release of Blizzard Entertainment’s first new StarCraft II: Wings of Liberty custom map: Burning Tide!
Featuring timed lava surges and collectable mineral caches, Burning Tide is a 3v3 map that combines several thematic elements from the epic single-player campaign mission “The Devil’s Playground.” Like the campaign mission, the goal of this game is greed, and the first team to reach the specified resource total wins! Players hoping to achieve victory on this map will need to work together, carefully managing their team’s unit production and safeguarding their vulnerable workers as they defend against enemy forces.
Check out Burning Tide now in the custom games list in the game client.