Blizzard released the Starcraft 2 Heart of the Swarm Opening Cinematic Trailer for their upcoming Starcraft 2 expansion. The trailer comes in at just under three minutes in length and it is purely cinematic, meaning you won't find one but of actual game play footage for Heart of the Swarm. That being said it pretty to watch and s an exciting three minutes as they try to pack in as many animated Terran and Zerg units as possible.
Starcraft 2 Heart of the Swarm will add approximately 20 new missions in the story mode campaign and which mostly centers around the Zerg. The multiplayer portion will include new features, maps and units as well as Battle.net support for groups and clans allowing player to form groups of friends and teammates. Starcraft 2 Heart of the Swarm will be released on March 12, 2013 and will require Starcraft 2 Wings of Liberty (compare prices) in order to play.