The Killzone: Mercenary open beta will be making planetfall next week. PlayStation Plus subscribers will have the first shot at the title's multiplayer on August 20.
Everyone else will have to wait until August 27 for an opportunity to get in on the action. The beta program be decommissioned on September 3, giving Guerrilla Cambridge an opportunity to make any last minute tweaks ahead of the first-person shooter's September 10 launch.
Surviving the Killzone: Mercenary Multiplayer Beta [PlayStation Blog]