There is no way that the Wii U will sell as well as the Wii and hit 5.5 million units. What an optimistic number. Unlike the PS3 and the Wii, the Wii U's second week numbers were even worse than its first week numbers... Maybe because ZombiU got some bad reviews, maybe because others aren't convinced by the hardware... Either way, I say around 3.5million, 4 million optimistically.