Yes, there are cancellations. There are also waitlists, so make sure you are on a waitlist or 2 to take advantage... Try to piece together a trip (even if it means moving resorts several times) if you need to book airfare..
I think 30 days out typically becomes the greatest cancellation window (a 30 day cancelled reservation becomes more restricted holding points, so people may release unsure trips at 31 days..) For months prior to my Last October trip , there was nothing at AKV for my 2nd to last day. I did have a backup at OKW. 30 days out, my waitlist finally came through..
The other factor that might help you a little, AKV Kidani, BLT and SSR (THV) are in active sales (which means not all occupiable units are available for members to book on points), so as more members buy into
DVC, a little more availability will open up to members...