New Zerg Unit: Swarm Host
Controlling a Spawn Host is horrible. Their horrible back spots burst when they're burrowed, making them look like an infected strawberry. Nonetheless, they're useful as siegebreakers, or as their own siege unit. Browder said he wanted Zerg players to have a chance to capitalise on successes, taking parts of the map as their own instead of being forced to expand willy-nilly. Park a few Spawn Hosts outside an enemy base and you'll annoy the face off a Siege Tanking Terran, eventually forcing him out to deal with your disgusting friends. From there, it's easy to send in the Zerglings and surround the cleanup troops.