The OP is four months old. For anyone that doesn't catch that on a quick read, the December TA calendar did not just come out (that happened at the end of June).
NOW ... if you click the link, you'll also notice that the December calendar that's posted was last updated on October 13. So it does reflect the extended hours through December 9.
I'm with the PP ... hoping for extended hours in December as well, but as noted in the OP, expect hours to be updated as we get closer. We should know about extended hours in the next few weeks (last year, the extended hours for the last few days of December were not released until mid-November).