I have read from unofficial sources that DVC resorts usually have a soft goods refurbishment -- sheets, bedcovers, curtains, etc. -- about every 7 years and a hard goods refurbishment -- furniture, TV, beds -- about every 12 years. Part of our yearly maintenance fees are used for capital reserves, which includes interior refurbishment and common element renovations.
As Disneynutz posted, its up to DVCMC to decide when renovations are done.
If memory serves me correctly, I think SSR will have a soft goods renovation within the next year or so.