If Sony can keep up with supply then Ps4 might sales more, but only slightly. The Shortage of PS4 in America just left the door wide open for the Xbox one. I am not sure if Xbox one will beat ps4 this January since this is really a dry month for games.. At 499, if MS can sell 60% of what they sold in December, I am sure they will be happy [60% is highly unlikely but who knows]
Praise the One.