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.

Viper
New detector and spellcaster meant to replace the Overseer and can pull units away from each other and make blinding clouds meant to reduce all range attackers firing range to 1.

Removed units
The Overseer will not be seen in Heart of the Swarm.

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

Banelings
Banelings get to move while burrowed.