Today Blizzard launched its first expansion to StarCraft 2, titled Heart of the Swarm. When initially developing StarCraft 2, Blizzard made the decision to split the game into three parts, each with a campaign as long as the original StarCraft. The initial release in 2010, Wings of Liberty, centered on the story of the Terrans. The newly-released Heart of the Swarm is focused on the Zerg. The final release, Legacy of the Void, will dedicate its campaign to the Protoss (and does not have a projected release timeframe yet). In addition to the new campaign, new units have been introduced for multiplayer and new maps have been added, which ought to shake things up in the competitive landscape. Blizzard has also made long-awaited improvements to the social system, including support for groups and clans.