I think the week of February 6 is most likely to me, though I could also see it being the week of February 13. Ultimately voted for the first half of Feb. I imagine we will also get a Pokemon Direct on Pokemon Day detailing SV DLC and hopefully some other stuff.
I don't really see a Zelda blowout direct happening until April because usually these blowout directs are a solid month before the game releases. Am expecting a somewhat substantial trailer in the next direct though.
I could see them announcing Advance Wars for a release either late in March or early April, roughly a year after its initial delayed release. I could also see the next Mario Sports title getting revealed (praying it is Mario baseball and praying even more that it is good). I don't see anything major for Pikmin 4 & Metroid Prime 4 until E3, though if Nintendo is finally ready to release Prime HD, I could see a teaser for Prime 4 or at least confirmation that we will get information later this year.
I could see Donkey Kong getting announced here for a holiday release. Directs always have at least one new game announcement and do touch on things outside of the timeframe they are supposed to cover.