I think installed base of the ps4 will be 16 million by feb 2015
Six million in six months? Nah, it'll be higher than that, by then. Closer to 20 million.
ww predictions till end of the year:
600k PS4 August - 10.7m
1.3m PS4 Sep. - 12m
900k PS4 Oct. - 12.9m
3.1m PS4 Nov. - 16m
2.8m PS4 Dec. - 18.8m
I agree with this prediction, overall.