New units and new tactics. Oh, and one hell of a preview trailer too – welcome to StarCraft II: Heart of the Swarm.
Heart of the Swarm is an expansion to StarCraft II: Wings of Liberty and a sequel. It’s not part three of the trilogy; that’s expected to be Legacy of the Void. Heart of the Swarm, as you might expect, puts the focus on the Zerg.
The action centres on Sarah Kerrigan but it’s not yet clear whether she’s the hero or the villain. She’s certainly an infested Terran. I suspect you’ll have to get to the end of the game before we find out.