^^
I definately remember reading it on N4G.com/industry or N4G.com/E307 i cant remember but it was a while ago and they definately said something like that i will try to find it again but dont expect anything soon N4G.com search is crap and to specific.
End of 2014 Hardware Predictions (03/03/14)
PlayStation 4: 12-15million
Xbox One: 7-10 million
Wii U: 8-9 million (Changed 01/04/2014 from 7-9 --> 8-9 million)