In a very recent interview with Activision's Mark Lamia, website Pressfire had this discussion with him on Call of Duty: Black Ops II coming to Wii & Wii U:
"PressFire: Do you have a release date?
Lamia: November 13th
PressFire: That’s around the same time as the Wii U launch, isn’t it?
Lamia: (smirks) It is… That’s what I hear, rumor-wise. I don’t think they’ve announced a launch date for the Wii U though?
PressFire: They said before christmas? But that overwatch mode, on the Wii U pad …it seems kind of obvious?
Lamia: (laughs) Do you want a job in game design?
PressFire: (laughs) So is there a Wii U version coming?
Lamia: Ah! We’re not.. we’re only talking about the other platforms at this time.
PressFire: I know.
Lamia: But here’s what I can tell you: Treyarch has a long tradition of working on the Nintendo platforms. A long tradition.
PressFire: That’s right, you did the Wii versions of the Modern Warfare games.
Lamia: Uh huh, and the Wii versions of all our Call of Duty titles. And we made the GameCube version of Big Red One. And the Wii version of Spiderman Web of Shadows. We have a lot of experience on the Wii and on the Nintendo platforms. So yeah, we enjoy the Nintendo Wii. We enjoy working on that."
I actually think it would be shocking if Blops 2 were not on the Wii U. The only reason I could think of is if Nintendo delays the launch of the system until next year, but we already know that will not happen.