From my understanding through today's update, it was their program to buyback and sell foreclosed properties at a discount to existing owners. They started that program during the recent recession. It is now superseded by Ovation. Again, I knew/know nothing about OVP. I am familiar with Ovation. Wyndham group (Worldmark/Club Wyndham...) will take back fully paid timeshares from owners. Ovation is good for owners and great for Wyndham (generic name for all timeshare systems under Wyndham).
I don't know that Ovation offers deebacks to Shell and WM. I would guess not in the case of Shell, seeing as it's so hard to give them away.
The OVP confuses me a little....they don't have to "buy" back foreclosures, as they simply take them in lieu of the default owed. I'm sure Wyndham would much prefer selling club memberships over intervals, and would guess that any intervals they take back are being deeded into the CWA to expand that footprint. I've never read of Wyndham selling a takeback to owners at a discount, but I'm aware that I haven't read everything yet.