From Anandtech - http://anandtech.com/show/10014/sony-enters-ssd-market-slw-m
Long shot but ala 12GB PS3, a super-slim PS4 with embedded flash drive and expandable external storage via USB?
Sony-Asia this month introduced its first own-brand solid-state drives that it will sell in retail. The decision to start selling consumer SSDs is completely unexpected because Sony has been trying to focus solely on highly profitable and less competitive businesses in the recent years, whereas the competition in the market of consumer storage is fierce. Initially, the company will sell only two SSD models, which means that it is trying to test a new business rather than to become a leader on the market.
The Sony SLW-M SSDs are based on the Phison PS3110-S10 controller as well as Toshiba’s TLC flash memory, according to images published by DIYPC.hk web-site. The SLW-MG2 solid-state drive from Sony features 128 MB DDR3 buffer made by Nanya. Usage of TLC NAND indicates that Sony’s SLW-M are entry-level client solid-state solutions that do not cost a lot to make and are not supposed to be expensive, and based on the specifications listed it's a reasonable guess that performance will be near the similarly-built low-end OCZ Trion 100 series.
Long shot but ala 12GB PS3, a super-slim PS4 with embedded flash drive and expandable external storage via USB?