- Nomad: replaces Mine Drone with building Spider Mines.
- Battlecruiser: replaces Plasma Torpedoes with Missile Barrage: an AoE AtA ability.
- Thor: gets its anti-air attack back. Loses Barrage again.
- Mothership: loses Time Bomb and Black Hole. It gains the ability to be used as a destination point for Warp-In, and can transfer energy to units below it. And has passive AoE cloaking.
Protoss Buildings and Mechanics:
- Phase Cannons: cannot become mobile.
- Overseer: gains the following abilities from the Overlord: Creep generation, resource corruption. [The move of Creep generation may have just been a mistake by Karune]
Zerg Buildings and Mechanics:
- Sunken/Spore Clusters: can become mobile.
- Zerg loses individual unit upgrades, reverts back to SC1-style upgrades.
- Units must have vision on a unit to be able to fire at them. And units firing from a cliff do not give vision to other units. Thus, to attack units on a cliff, you must gain vision over them.