Starcraft II: Heart of the Swarm - teaser (Game)

StarCraft II: Heart of the Swarm is an upcoming expansion pack to military science-fiction real-time strategy game StarCraft II: Wings of Liberty, and the second part of the StarCraft II trilogy, the third being Legacy of the Void.
The expansion will include additional units and multiplayer changes from Wings of Liberty, as well as a continuing campaign focusing on the Zerg species. It will span approximately 20 missions and will be priced as an expansion set and based on hints from Blizzard likely to be released around April 2012, and very unlikely to ship before the end of 2011.

text source: wikipedia.org