Good Evening,
I wondered the same thing when I got back from our vacation in December, so I called and was told that you can book up to 499 days before the chosen day of arrival (packages included). I booked my December 2006 trip in September 2005. I would suggest you go ahead and book as soon as you choose your dates. Ticket prices and resort taxes went up after I purchased my package, but it didn't effect my package at all. I would book now and if and when prices go up this year, you are already booked. If a discount promotion comes along, then you can always change your package up until the 45 day mark prior to you trip. Hope this helps!!!!!
PrincessSuzanne