I'll stick with my early year estimate of about 130m. I'd be curious to hear from the "more than 140m" crowd to see how they get to that number.
By the end of this year it will be around 118 million units sold o customer.
End of March around 120 million units. Even PS3 sold around 11 million units after PS4 released.
The PS3 sold less than 7.4 million after PS4 released.
"Sony Computer Entertainment Inc. (SCE) today announced that cumulative sales of the PlayStation®3 (PS3®) computer entertainment system has reached a milestone of 80 million units*1 worldwide as of November 2, 2013"
"As the PlayStation®4 computer entertainment system launches November 15, 2013 in North America and November 29, 2013 in Latin America and Europe, SCE will continue to expand the PlayStation ecosystem, which includes the continual support of gaming and digital entertainment content on PS3 systems."