Yesterday, Sony opened up its closed multiplayer beta for the PS Vita first-person shooter, Killzone: Mercenary, to select players. However, it's about to invite an even bigger audience in just a few weeks' time.

Sony announced that it will launch an open multiplayer beta for the game later this month, prior to the game's arrival in September.  Guerrilla Games Cambridge and Sony have released a new trailer highlighting this part of the game, which you can view below.

Players in the beta will be able to access both the free-for-all Mercenary Warfare mode as well as WarZone, which mixes and matches five different activity types into one timed team-based event.

Killzone Mercenary releases via retail and PlayStation Network September 10th.