Huge sales, it will be interesting to see if 2016 can top this.
i think it can, if they are aggressive with bundles through out the year, that CoD bundle for 350$ is a very good start. and an Uncharted 4 bundle in the middle of the year can move quite a lot of units as well.
it also depends if they are aggressive in the holidays like they were this year. a price cut then some promotions thrown at it. coupled with some more bundles and marketing deals. if they do all that, and Horizon and GTS arent delayed and make it holiday 2016. i think the PS4 can be up YoY.