Heart of the Swarm is an upcoming expansion to be released for StarCraft 2. It includes the 2nd of 3 campaigns, following the Wings of Liberty expansion, and will precede the Legacy of the Void.
It is set for an as of yet unannounced 2011 release. It will feature new characters, skills, and a refreshingly unique campaign, with 20 new missions.
StarCraft II: Wings of Liberty holds the record for the fastest-selling strategy game, totalling more than a million units in one day. If the fans were pleased enough, then Blizzard should expect to break that record.
