poklane on 10 December 2015
CosmicQueso says the PS4's YOY increase is around 85%. http://www.neogaf.com/forum/showthread.php?p=188749847#post188749847
Assuming an YOY increase of exactly 85% we'd have the following:
PS4 = 840*1.85= 1554k
XB1 > 2699-1554= 1145k