I don't think it will be up 69% for December.
It's easier to have flucuations like that when you're talking about low level sales that can raise in baseline quite easily.
For example it's not so hard to go from 40k one year to 90k the next year given the right title.
Put going from 460k to 1 million year over year is much, much harder.
True! But said title is getting its first holiday sales along with Super Smash Bros Wii U. if Nintendo markets the latter right and not let 3DS cannibalize its significance.