PS3 shooter Killzone 2 received its first post-release content today in the form of a map pack. The "Steel and Titanium" map pack can now be downloaded through PSN for $5.99.

"Steel and Titanium" contains two multiplayer maps. The first map takes place on a Helghast freight train ("Steel") while the second brings players to an ISA attack cruiser ("Titanium"). Trailers for each locale can be seen here.

With "Steel and Titanium" now released, perhaps we'll hear some more information about the second map pack soon. Back when the first map pack was announced, Guerrilla Games managing director Herman Hulst said that the next pack's title will include the word "Retro."