We added onto our VWL membership during last week's cruise, and I asked why it was available again.
My guide told me that originally Disney held back 30% for their own use, instead of the 3% that's held back at the other DVC properties. The reasoning behind this was that this resort has one of the highest repeat guest ratios.
It recently was decided that VWL was to have the same 3% held back as all of the other DVC properties.
They had a board up with all of the properties that have availability and the use years. I focused on February as that's what we needed. I'm sorry, but I can't remember the other months for VWL.