I own a Week 52 at Grandview in Points. If you own week 52 in weeks or points it would say so on your deed. For Points owners you need to request week 53, pay the additional MF, and they will have the additional 122,000 points deposited into your account with RCI. You can take the week as a reservation at the Grandview for New Years as well, but this must be done during the appropriate Home Week/Home Resort booking period.
I own a Friday to Friday unit and this year is the year I get the additional week. I believe that Sat-Sat ownerships also get the additional week due to the leep year this year. The additional week comes around once every 6 years or so.