If a leaked screenshot is anything to go on, the Helghast-hunting sequel Killzone 3 will involve more shooting, and plenty of ice and a co-op mode.Sev and Natko, two of the lead characters in the game, are seen facing one another in a split-screen mode. Nicagamerz says it is of a co-operative mode, but whether it is online or not remains to be seen. It's also worth pointing out that it could just be a multiplayer-specific mode or part of a fully-blown co-op campaign.
Either way, Sony is obviously saying nothing at this point. With the game out in February 2011, we won't have long to wait until the beans are truly spilled though.
Soure:
Nicagamerz