You should be able to book for that time period if you call WDTC. Alot of the room categories haven't been opened yet. The wonderful CM I talked to today said that sections of rooms will be opened up throughout the year.
That is really hopeful for me, because I was not able to book GF or Poly for Thanksgiving weekend. I'm hoping that the rooms just haven't been opened up yet.
I hope this is true! There were only suites available at CR the 1st week of December There can be that many of us crazy planners planning a trip 16 months out!!