StarCraft II: Heart of the Swarm/New Zerg units

Swarm host
This unit will not need burrow upgrade to burrow and once burrowed it attacks its foes nonstop. It is like a ground version of the Brood lord only it spawns locusts instead of broodlings.

Viper
New spellcaster unit that abduct units and makes a cloud that reduces ranged units attack to 1.

Ultralisks
Ultralisks can do an ability called burrowed charge to speed up the rampage of an ultralisk.

Banelings
Banelings get to move while burrowed.