Blizzard has released a new StarCraft 2: Heart of the Swarm trailer.
According to the official blurb: "Sarah Kerrigan embarks on a path of great vengeance and furious anger. While pursuing her revenge, the Queen of Blades also seeks to reclaim her living empire."
Blizzard has confirmed a StarCraft 2: Heart of the Swarm release date of March 12, 2013, as well as details of the Collector's and Digital Deluxe editions, which you'll find through the link above.
The company will release StarCraft 2 patch 2.0.4 in the run-up to the expansion's launch. It will introduce many of the features and improvements from Heart of the Swarm, including a new interface with fresh menu screens, in-game clans and groups, plus new replay features and matchmaking options.
Earlier this month Blizzard also released the StarCraft 2: Heart of the Swarm opening cinematic.