@GOPJEW - I'm having a similar experience. I was mid-dec all along... now I'm being told last week of the year. On tesla.com mine still shows "Your Tesla is currently in production". On Dec 7th I got "Your Model X has completed production and will be on the way to Rockville in the next few days. I am expecting it to arrive shortly after the Christmas holiday and we can plan your delivery for the last week of the month."
Will see - I can wait. I've waited this long. I am a bit concerned about receiving it in 2017 though.