Ah yes. A return to the old ways. Good.FOR THOSE UNFAMILIAR: You will not be able to directly join Server 2 as you would join Server 1. You will need to go through a transition zone in the city to have your character moved over to the next server.
Thus, the character slot currently on S2 cannot be selected on S1, and vice versa.
Xenians/Overwatch will have the override to be selected on any server regardless of where they were moved last.