HD link http://youtu.be/SG_3R9BoVvg?hd=1

http://us.battle.net/sc2/en/game/heart-of-the-swarm-preview/

Heart of the Swarm is the first expansion set to Blizzard Entertainment’s sci-fi real time strategy game,
StarCraft II: Wings of Liberty. Heart of the Swarm continues the epic story from Wings of Liberty with
an all-new campaign that focuses on Kerrigan, the erstwhile Queen of Blades. New multiplayer content
will also be included in the expansion, as well as new features and upgrades to the Battle.net online platform.

Heart of the Swarm’s campaign will include approximately 20 new missions