I believe SSR is sceduled to open on May 17. There are DVC Members grand opening events scheduled the following week. Initially, only one building will be opening. As of last week availability for DVC members was limited. Not sure if any of the opening inventory has been given to Disney for cash reservations. If so, you should be able to make reservations now.
As with all DVC units, a studio and 1 br sleep 4, not including children under 3. A 2 br sleeps 8.
As for speculating on cash rates, I'd imagine they'd be similar to OKW.