It's still installing, but from what I heard here a few of the new things:
Barracks = SJW's - They don't really fight anybody, they just shame other Terrans into losing health.
Upgrade = The SJW's have the ability to make other enemenies drop their weapons by yelling "HANDS UP! DON'T SHOOT!" over and over.
Now whenever you click on the SCV's or Probes to get Ore, a smaller "consent" box will appear that you have to click on so they they know THAT'S OKAY to take something that didn't belong to them.