Prediction: PS4 will sell 37,000,000 by Dec 31. 2015

[FrozenXIV]

37m is possible since the ps4 will probably sell a few millions this year in Japan with all the Japanese games coming out... FF Type-0, Bloodborne, Persona 5, Disgaea 5, FF X/X-2 and maybe FF XV and KH3... The only Japanese game that came out in 2014 was Knack.