I'm not a server guy, especially for something as big as what we're talking about, but what I meant was issues that the development team could detect on their end. Questions like, "how is our matchmaking server holding up with 10,000 people? Can we increase it to 50? Now how about 100? Okay, now we're seeing an issue on the east coast, let's scale back and take a look at that region..."
Dealing with a huge software suite like that is a completely different beast compared to how us regular developers think about things. It's not so much bug reports and debugging as it is monitoring entire systems to see how they hold up against growing waves of people. With a brand new system, simply letting everybody in at once isn't the way to go- you have to make sure your system can handle 1000 people before you let a million people on it.