Sony announced on its official PlayStation Blog that players will have access to the beta for SOCOM 4 if they purchase Killzone 3.
You will have early access to the multiplayer beta for SOCOM 4 where you can play with up to 32 players online. Eligible copies of Killzone 3 which include both standard and Helghast editions, have a PSN code inside the box for you to redeem.
You can redeem the code once the beta goes live. The exact date for when the beta goes live is yet to be determined, but you can visit SOCOM.com for all the latest updates.