First of all, congratulations on passing ROFR! The worst is over.
As far as availability, the only time availability has any meaning at all is when you are on the phone with MS making a ressie. What someone may think today about availability in December a month from now is completely irrelevent.
That said, I'm sure you know your chances this year are slim. That is an incredibly busy time, and I'd be willing to bet there is no availability at all during that period right now. Ressies during that period are typically booked right at 11 months, so plan early for next year.
However, you never know until you try. So when you close and get in the system, give MS a call. You will almost certainly have to waitlist.
The more flexible you are, the better luck you will have. If you can adjust days a little, and will take anything anywhere, you might get lucky. People's plans do change and there are cancellations, so never say never.
Good luck!