I'm not gonna predict PS4 or X720 because if they release sooner or later than I think then my prediction will look ridiculous.
Anyway...
Wii U - 6.8m
PSV - 5m
X360 - 7.1m
PS3 - 8.3m
PSP - 1.2m
3DS - 11.5m
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right