SOCOM 4 was meant to be released last year, after being shown at GDC 2010 with PlayStation Move support. However, the game never materialised and it was simply put down as "TBA 2011" by Sony.
That appears to have been changed now though, as the Wall Street Journal are reporting that they've heard the game will see an April 2011 release.
This is great news for PlayStation 3 fans, and fans of SOCOM in general. They've been waiting for a while to get their hands on the first true SOCOM of this generation.
Source: Wall Street Journal