We are going Dec 16-21st. When I intitially booked our trip there were virtually no rooms...so we booked offsite. About 35 days out tons of rooms started opening up in all categories (even the Skyliner hotels). At one point I had 4 hotel reservations booked because I couldn't decide. Since our trip overlaps with days where all the parks are sold out, I would assume you would see openings for January.