Thanks for the replies. This will help make my decision on whether I will renew and try to use the AP rate on a room with the new system next summer. Just getting all the facts and watching the info that comes out between now and then.
For our situation, I'd be out $80 (difference between our type and length of MYW and AP) if a rate wasn't available for our dates. We will probably return later in June and my pass will expire before we return.