I dont think 7-10 days is very accurate...it is more just luck. However, I think the newegg sales have been the most organized and have consistently been shipped sooner than the advertised ship date. My guess is that all the non-fly more combo orders will ship by next week.
If you order today, they will likely be able to ship sooner than 1/1/17 however there are a lot of holidays coming up so even if they ship the package might take longer in transit.
My order was shipped about 18 days after I placed it....but there were others who placed orders a week and a half after me and were able to make the same shipping allotment. Point is that if you order now, it will probably still be closer to 1/1 and maybe sooner. You could also wait a week or 2 and probably still get it in the same window if the allotment doesn't sell out.
*EDIT*
There is a difference between shipping windows for the combo and non-combo. And that no one knows which will ship first.