From the PlayStation.Blog
"Hey all, tomorrow our third DLC "Napalm & Cordite" will be released, allowing you to nail or toast your enemies with the addition of the Boltgun and Flamethrower. For those of you that might have only just picked up Killzone 2, or have not jumped on the DLC wagon yet, we've got an announcement to make.
Also going live tomorrow is a Bundle of map packs Steel & Titanium, Flash & Thunder and Napalm & Cordite combined. And we are calling it the 'Map Pack Bundle', original I know, but it does what it says on the lid. The bundle is being offered as..."