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Were people jumping the gun a bit too early with the assumption that Nuketown 2025 wasn't coming to the Wii U version of Black Ops 2? If this customer service response to the inquiry of Black Ops 2 coming without the code for the map is to be believed then people may have nothing to worry about. It could also have something to do with the fact that the Nintendo eShop will need to be downloaded with the day 1 update of the system on launch day. How Black Ops 2 on Wii U interacts with the eShop for DLC remains to be seen but it could have something to do with "no code" being received with the physical copy of the game.
Nuketown was probably the most popular map with the original Black Ops so for the Wii U version of the game to be without the sequel map just doesn't make any sense. Activision could have done a much better job however in communicating about it for potential Wii U owners, unless it was Nintendo themselves that stopped them. Regardless of this, I think it's safe for those who were planning to buy this game on Wii U to go ahead and keep planning on it.