For years its been reported that they have been sometimes providing air mattresses. But - and this is a big but - they aren't likely to stock enough air mattresses for every single room even if they start making it known that they are providing them. Air mattresses pop and break over time (and with abuse that sometimes is known to happen when kids jump on things like air mattresses). They may have one, or they may have handed the last one to someone who checked in half an hour before you. So even if the policy changes (and its still on the website), I would still plan on bringing your own air mattress if such a thing is important to you - unless DVC starts stocking them in the rooms like they currently stock pack n plays.
