From StrategyWiki, the free strategy guide and walkthrough wiki

[edit] Returning Zerg Structures

• Hatchery

• The Zerg continue to use Hatcheries in StarCraft II. Two rally points are able to be set on a Hatchery; one for Drones and another for warrior units.

• Infested Command Center
• Spawning Pool

• The Spawning Pool is set to appear in StarCraft II. It allows the spawning of Zerglings and offers upgrades such as increased movement.

• Extractor
• Evolution Chamber

• The Evolution Chamber is set to appear in StarCraft II. Contains research upgrades for burrow (unlocks burrow), slime (Overlord), generate Creep (Overlord – this ability also increases Zerg buildings' Creep generation speed), and allows the Queen to produce Shriekers, increasing the range of the Sunken Cluster and Swarm Cluch abilities.

• Hydralisk Den

• The Hydralisk Den is set to appear in StarCraft II. It unlocks the Hydralisk and researches attack and armor upgrades for them. It can mutate into a Deep Warren, enabling Lurkers to be developed.

• Spire
• Greater Spire
• Ultralisk Cavern
• Hive
• Lair

[edit] New Zerg Structures

• Infested Barracks
• Infested Supply Depot
• Nest

• The Nest is a Zerg structure set to appear in StarCraft II. It allows Zerglings to morph into Banelings and contains Baneling upgrades (increased weapons and armor).

• Roach Den

• The Roach Den is a Zerg structure set to appear in StarCraft II. It enables the spawning of Roaches, and contains Roach upgrades (increased attack and armor).

• Deep Warren

• The Deep Warren is a Zerg structure set to appear in StarCraft II. It is evolved from the Hydralisk Den and is required for the development of Lurkers, also providing upgrades for them.

• Nydus Warren

• Expect the Queen to be able to build structures like the Sunken Cluster.