Napalm & Cordite, the new weapon pack will be coming to Killzone 2 as part of a new weapon's pack. Here are a couple of descriptions of the weapons thanks to the Playstation Blog.
Napalm: The VC1 Flamethrower
Found in the Suljeva Cliffside map, the VC1 Flamethrower projects an ignited stream of flammable liquid at high pressure. Consisting of low-octane gasoline and an unidentified component indigenous to Helghan, this form of Napalm is extremely effective for clearing out enemy trenches and bunkers.
Cordite: The Boltgun 4400
Also known as “The Handyman”, the semi-automatic Boltgun 4400 can be picked up in the Arctower Landing map. It uses Cordite to propel metal bolts at an extremely high velocity, often pinning its targets to walls and other objects. In addition, each round contains a time-delayed explosive charge – so if impalement doesn’t finish the target off, the ensuing explosion will.