StarCraft II: Heart of the Swarm/New Terran units

Battle Hellion
Hellions can transform into tougher, slower and stronger walkers with shorter range but the splash damage is wider.

Widow mine
Widow mines attached themselves to enemy units and causes major damage in a radius.

Battlecruisers
Battlecruisers gets a speed boast ability to flee from faster foes or reach their destinations faster.

Removed units
The Shredder is now removed from the game.