- Jackal: now called Hellion. Same unit otherwise.
- Nullifier: Hallucination changes: instead of copying a unit you already have, you create units. This can create several of a particular type of unit from a single cast. Note that you specifically do not have to have the tech for a unit to produce a Hallucinated one.
Protoss Buildings and Mechanics:
- Observatory: Removed. Observers only require a Robotics Facility.
Zerg Buildings and Mechanics:
- Hydralisk Den: requires a Spawning Pool.
- Creep Speed Boost: Zerg ground units move faster on the creep.