depends to what do your intend on making reservations.
Things like Cindy's and LE Cellier are surely fully booked, but I called this week and managed to get ADRs for Coral Reef and Teppan Edo for Dec 23rd (a week before you arrive).
I believe that for the 30th and 31st and 1st it will be REALLY crowded and probably most restaurants will be fully booked, but for the rest you might get some nice things.
I suggest you call and try anyway, there's always the possibility that some people cancelled or that there is still room in some restaurants!
Call and try for what you want. It only takes one reservation! Just have a long list of options, be flexible on times and you might be pleasantly surprised!
I just called about a week ago and made our ADR's for the week of January 6-13th and got every restaurant that i had wanted at the time i had wanted Our ADR's included Cali Grille, Le Cellier, Coral Reef, Yachtsman Steakhouse, and many others. Good luck!!
I just made our ADR's for Dec21-Jan1 yeasterday due to having to cancel and rebbok thanks to DH work. I got everything I wanted but the castle For a party of 8. On 2 evenings the times are on the late side but we will take it. Places like CMickey's and LTT with no trouble I was in shock!