From the Christmas issue of the Radio Times, Steven Moffat's rules for Christmas Specials which are decidedly Christmassy.
(Yes, I know, if I keep this up I should give Christmas Specials their own category.)
1: Santa Claus Is Real.
2: There Should Be Flying.
4: The Greatest Christmas Story Is A Christmas Carol.
Make of that what you will, but is suggests in a fortnight we'll be seeing something festive, storybooky and Dickensian.
If you want lashings of RT-style spoilers, read the whole article at Combom.