I dont know if you see people, but there are new adjustments :
PS4 : 312k > 331k > 374k now
So after 2 adjustments, Vg chart added 62k to the initial numbers, and i have the feeling it's not everything yet.
So it's easy to see why a lot here think PS4 is obviously understracked
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m