I think Pikmin has a good chance to get a holiday boost from new Wii U buyers, and top 1 mil. physical copies. I'm sure it's already well over it with digital.
Smash will obviously sell 1 mil.+ before the year is out, no problem.
Hyrule Warriors, I think, will surprise people. Between strong Japan sales (where Warriors is huge), and Western sales (where Zelda is huge), I think it'll do well. That plus I have a feeling Nintendo might actually bother really pushing this title advertising-wise.
Bayonetta 2 is a dice roll really. It COULD wind up passing a mil. in just a couple of months, as the current 7 mil. or so Wii U ownership base are mostly "core" Nintendo gamers, many of whom are excited for the title. But it also might not. I think it will pass 1 mil. LT eventually, just maybe not this year. But we'll see.
I think that Treasure Tracker also might surprise people, but considering how close to Christmas it's releasing, who knows.
There is also the possibility of a darkhorse candidate like DKCR2 or Lego City getting a holiday boost as well, and finally passing that 1 mil. mark.
Safe bet is, at least 9 Wii U titles will be 1 mil. or more by the end of December. Possibly more.