My entry screen has.......well........the wizard I'm currently playing is standing in the middle. On her right (her right) is a seat, and behind that as seat, and another one behind that. Same thing on her left. Three more seats. Create seven wizards and see what happens.
Correction: There is no 7th character Slot yet. The one that is standing belong to one of the 6 seats. The other desks are there for decorating possibly for more slot to open in the near future. People are not asking just for the 7th Character slot its self but the 7th wizards that goes with it.