wii u -ps4 gap will be bigger no way wii u will do 40m i think it will do a bit less then half of that numbers and no way ps4 doing less then 100m
My prediction
3ds:85m
psv:15m
gap:70m
ps4:120m
wii u:25m
gap:95m
PS4 - over 100 millions let's say 120m
Xbox One - 70m
Wii U - 25m
Vita - 15m if it will not get Final Fantasy Kingdoms Heart and Monster Hunter 20m otherwise
3DS - 80m