Probably just like they have before. This not the first time folks have lined up in a mall to get into the store. I waited in a very long line for opening day of an Apple store, and for an OS X release. On one occasion the line went all the way down the middle of the mall and out the doors.
Call the mall's management and security offices during the course of the week to ask what they are planning. Most won't allow overnight campers, which is great for people, like myself, who weren't planning to camp. Most won't let people line up until the mall opens.