Well it's at around 12 million by the 4th of October, so if Holiday sales represent 50% of the year's total, then that would make it 19.6 million by the end of the year, I voted January, but I think mid January is likely.
I think it'll probably hit 25M by Sony's March 2015 target of 17M.
40 Million by the end of 2015 is highly likely IMO.