Stab people in the face, snap their necks, and mow them down while riding mechs. That's just some of what Killzone 3 has install for online combat, and you can see it all in Guerrilla's debut multiplayer trailer screened at GamesCom. Aside from the brutal melee moves and vehicles, Killzone 3 will also feature 2 new game modes, a new matchmaking system, abilities and rewards. ...