According to Blizzard's Dustin Browder, the StarCraft II team has not settled on exactly how many Battle Focuses will be available at launch. The placeholder user interface featured during the demo left spots for four focuses. But according to Browder, that number is not final and could be increased to six.
What's important to take away from the customization options for Kerrigan, is that she will be leading the charge in almost all of the roughly twenty singleplayer campaign missions planned for Heart of the Swarm. Unlike Wings of Liberty, where the Terran protagonist Jim Raynor only made cameo appearances as a playable hero unit, Kerrigan will be at the frontlines, leading the Zerg into battle and crushing world after world as her brood and infestation level grows and evolves.
Above: Expect to do multiple missions on each planet as Kerrigan conquers the sector
Above: Like the Armory in Wings of Liberty, the Evolution Chamber is where you'll choose how to upgrade new units
Above: A closer look at Abathur
Back on Char, we have two more zergs of note to click on in the meta game before we move onto our first mission. Our first stop is Abathur. Created by the Overmind, Abathur is your evolution master – and will help you facilitate various upgrades for all your new units. Like the Armory in Wings of Liberty, Abathur will be the one you turn to when it's time to decide how to strengthen your units with genetic upgrades from mutagen collected during missions. With nothing but zerglings to choose from this early in the campaign, our options were limited. It should be noted that the names and descriptions for these upgrades are not final. However, they will give you a good first-look at the direction that Blizzard is taking with unit upgrades in the Heart of the Swarm campaign.
Metabolic boost increases the already fast zergling movement speed. Posthumous Mitosis gives zerglings a 20% chance to respawn as two broodlings on death. But Rapid Genesis (our personal favorite), fixes it so that zerglings hatch instantly.
You'll also get to choose from two final evolutions for each of your new units. Evolve your zerglings into swarmlings, and you'll now hatch three zerglings from each egg instead of two with no extra cost. Or, you could evolve your zerglings into raptors, granting the ability to leap towards nearby hostiles with the added bonus of 10 extra life points.
With Kerrigan's Battle Focus set to Corruption and our zerglings upgraded, we turn to Izsha, Kerrigan's advisor of sorts. In practice, Izsha is the Zerg in the know, the one who'll give you your mission objectives and background lore about the planets you'll soon be conquering.
Your first step in establishing a foothold on Char will be to kill a rogue Zerg queen, who refuses to acknowledge Kerrigan as the Queen of Blades. Kill the renegade queen, and her brood will submit to you. The mission starts you off with a spartan base on a map with dormant batches of zerg eggs spread throughout the match. Far from the usual build-up-your-army-until-you-can-take-over-the-map objective, the mission pits you against the enemy Zerg queen in a race to collect the dormant eggs.