Renewed my preferred yesterday, and asked about adding VB, and adding it to the kids passes,which expire in November. The expiration date stays the same, there's no prorated cost for the remainder of the few months left, and there's no separate Waterpark only AP like Disney has. I know the difference to add the upgrade is minimal, but what I end up with is a pass I can use for just over 3 months between now and November 5th.