Sony has high expects with PS4. Internally, the company would like to dispense 16 million of PS4 (shipments) in 2013 according to Digitimes. It would be shipments, because Sony doesn’t give other numbers, only shipments ones.
PS4 will be manufactured by Foxconn Electronics and Pegatron Technology. The console should start its mass shipments in August. PS4 should be ready for the year end holydays in 2013. Therefore don’t relate these numbers as PS4 sold to the people.
Personally, I think it’s a large number for this year, but this quantity could allow Sony to sell PS4 in all the markets at the same period. In summary, Sony shipped 100 million of PSX, 150 million of PS2 and 77 million of PS3 until now.