I don't know the exact answer to your question, but I may be able to help a little. We are leaving for Disney in 4 days :sohappy: ...when I went to book in the summer, I got the same thing you did online. After calling reservations (1.407.WDISNEY) I found out that the prices for packages were not available, and the CM I spoke with said they would be out around October. (This was in June.) So, I went ahead and booked a room only reservation, to hold the room type we wanted, and waited until package prices came out. Then, it was easy to change the room only to a package price once they were available. Oh, they ended up coming out in August, I think it was.
Hope this helps a little!