Farsala on 18 November 2013
According to Vgchartz http://www.vgchartz.com/article/251395/playstation-4-launch-sales-are-in-call-of-duty-ghosts-leads-the-pack/ .
The PS3 had an attach ratio of 2.46. The PS4 had 1.73m preorders making 2.41m sales. About 39% more. Assuming similar amounts for the Xbox One, with about 1.5m preorders (?). That becomes about 2.08m sales.
2.41= 1m
so
2.08= 860,000 sales as my guesstimate.
