I was having the same concern/issue when I attempted to book for my fall trip. I called Disney and they confirmed that there is technically rooms available however they aren't all available for booking for various dates due to inventory management systems. Sometimes they hold rooms to make sure they don't overbook based on forecasting or up coming offers. I suspect that they are holding onto a few rooms in different category types in advance on the new offers being released. Their advice to me was to keep looking as room availability and release happens/changes daily. Good luck!