Killzone: Mercenary - trailer, gameplay, previews
I've run out of room to post the results of Pat and Sam's adventures with the Helghast, so hit the break to find everything in one place.
Once you've been through this lot, I can't imagine you'd need to know anything more about Killzone: Mercenary. But if the Vita title has somehow generated unanswered questions, leave them below, and I'll pass them on to Pat.