The Dark Pylon is not in the multiplayer version of the game. Originally, when it was being tested, it would cloak buildings in a radius around the building, making it more difficult for enemies to scout out 'tech' buildings in a Protoss base, to determine how they were teching. Additionally, it also hid base defenses until they began firing.

The Dark Pylon was taken out because it was not found as useful as what was intended. There are discussions of finding a possible replacement building that would also serve as a base defense, but nothing has been confirmed yet.

Thought I'd share with you guys that in internal gameplay, we've had some poor souls find out the hard way that apparently if you are playing Terran and you immediately lift off your command center to a close by high yield mineral field, you will easily make up the difference of the time lost from collecting minerals during that period, and essentially be able to out produce any other race very quickly. Thus far, it seems like it is easy to defend this new fast expansion strategy. Nonetheless, I'm sure it will be balanced in the coming weeks, but thought it was funny so I thought I'd share.

Sneaky Terrans they are.

Making lift off a researched ability and hard coating the minerals both seem like interesting ideas - I'll be sure to forward that along to the devs. Like I said before though, this has only worked on 'certain' maps. If anything, those maps could be modified slightly and it would probably fix it.

There has not been extensive testing of this yet, but in terms of Mutalisks, players will be able to stack, but it will be much harder to keep them clumped up. As more info surfaces about this, I will keep you informed.

Also, Mutalisks at first in StarCraft II while slowed down a bit before they attacked, but the code has been fixed to allow it to attack on the move like the original StarCraft.

In my opinion, Immortals are better against Terran but definitely still useful in PvZ matchups, especially against armored units that are harder to kill, such as Ultralisks and Roaches. Furthermore, Immortals are almost always the unit to be sent in first while laying siege to an enemy base, eating up all the initial base defense pounding.