They also removed most unused assets (Reaver, Dragoon, Predator (the air unit), etc.), (they literally threw all that work out the window!) and made it so that it is really long and hard to try and copy a unit from campaign (say, the Spectre) into a multiplayer mod. They really are shooting us modders and mapmakers in the foot. It's as if they said "there you go, you can do all this stuff with the editor, but we still want you to make maps like you did with SC1; no custom art and no campaign stuff in multi."
Ughhh, it's frustrating. >_<