According to VGC*
PS4 has seen an increase of 9.36 % in sales in Q1 2015, compared to Q1 2014.
Such an increase means, that PS4 is headed towards 15,6 m sold in 2015, compared to 14,3 in 2014.
Bear in mind, that PS4 is likely to receive a price-cut later this year.
I estimate that a total increase of 20-25 % is well within reach. Which would put PS4 at 17,2 - 17,9 in 2015







