Ubisoft has a finished Wii U game that it won't release until the console sells more

[JOKA_]

At first glance this seems ridiculous, "why wouldn't you just release it and make money?"

But I would bet that it has to do with advertising. If you are going to spend money on advertising don't waste it when you aren't going to make a lot of sales. They want to align that budget with a larger install base.