GT5 will sell 7-9 million
its low because what mantanahatchet said
halo reach should sell 11m-14m
its high for the opisite reason. there were 18m 360's at 3's launch and there will be 40 something million console when reach come out.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.