DigiTimes revealed that according to sources Sony is pushing for 16 million PS4 shipments in 2013.
Below are the details, to quote: "Having high hopes on its PlayStation 4 (PS4) game console, Sony internally expects the machine's annual shipments to reach 16 million units in 2013 with the supply chain expected to start mass shipments in August, according to sources from PS4 component makers.
The sources pointed out that the PS4 will be manufactured by Foxconn Electronics and Pegatron Technology, and the player have just begun the processes of request for quotation (RFQ) for the related components. Therefore, the component shipments are unlikely to start until August, but should allow the machine to show up before the year-end holidays in 2013.
Sony shipped a total of 150 million Playstation 2s and 100 million Playstations and has shipped 77 million Playstation 3s over the past seven years."
quote from ps3news