https://www.engadget.com/2009-07-08-psa-syphon-filter-5-socom-4-not-in-development.html
PSA: 'Syphon Filter 5', 'SOCOM 4' not in development
Jul 8, 2009 - In spite of previous reports, Syphon Filter 5 and SOCOM 4 are not in development -- well, at least not the games referenced on PCB Productions' credits page....
syphon filter 5socom 4psadevelopment