Sony has announced that for those who buy the specially marked packages of Killzone 3, both regular and Helghast editions, will get access to the SOCOM 4 multiplayer beta. A SOCOM 4 notice will be on the front of all eligible copies of Killzone3. Inside there will be a PSN code that when redeemed will grant access as soon as the beta goes live. No word on when that will be though.
Killzone 3 is set to launch February 22nd in the US, 23rd in Europe and 25th in the UK. No date for SOCOM 4 as of yet.