True SOG overflow is when you can pick your resort from a list SOG offers at a discount when they are booked. I have been able to choose from most any resort. It is simply a discount and you are a regular guest and can make any room requests as others(do this through SOG when you book or fax the particular resort).
Now after April 1 when SOG closes for rehab, those guests will be put at CR in the north wing. This is not really overflow and overflow can still be booked by those that cannot get SOG ressies. Confused yet??