People are really jumping the gun with Wii U locking in second from what I've seen. Nintendo launched one of it's biggest IPs exclusively for the Wii U. While the Xbox One really has no system selling exclusives that will push consoles until Halo. Add on to the fact that the Xbox One is guaranteed 3rd party support and to me that equates to a much higher % chance that one will have the second place locked down. However, nothing is set in stone... except the PS4 being number one overall, unless something monumentally charastophic happens.
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