@Deb & Bill is correct that unbooked DVC inventory might be turned over to CRO to use for cash reservations at 60 days. However, not all of that inventory is released for cash. DVC still retains some of those units for members who wish to book inside that period.
Your chances of getting a cash reservation at OKW and SSR when inventory is released at 60 days are the greatest, but just about any resort can be made available, depending on which resorts members have booked leading up to the 60-day mark.