Delaying with the intention of quietly canceling later in an attempt to soften the blow of an outright cancellation would be insulting. In any case, delaying the Wii U version doesn't make sense since it'll likely sell the fewest copies and now Wii U owners who wanted the game have to wait longer. If they have another console, they might just buy a different version. If Ubisoft is worried about sales and is still committed to releasing the game on Wii U, I think it'd make more sense to release the Wii U version first and let it benefit from front loaded sales. Wii U owners who really want the game won't have the option of buying it on another console initially.
Personally, I wasn't that interested in the game though I admit it will be yet another blow to the console if the game ultimately gets cancelled.