We are AP holders and have never been upgraded. We always go for special occassions...birthdays, anniversaries and such and always make it known, but still no upgrades.
Suppose it can't hurt to ask to be upgraded...the worst they can do is tell you "no".
The Swan and Dolphin are not officially Disney Resorts. They lease the property from Disney and hotel guests are able to participate in some of the extra perks like EMH's.