Source Eurogamer

Sony's upcoming PSP version of Killzone is due out in November on both sides of the Atlantic, and features co-operative and online multiplayer options, according to a bundle of leaked Sony marketing documentation that the publisher has yet to comment on.

The third-person tactical shooter was confirmed by Sony recently (there's also a PS3 instalment in development, as you know!) and the documentation we've seen sheds more light on its content and positioning.

Due out on November 3rd in both the USA and PAL regions, it's set two months after the conclusion of Killzone, and sees players take control of Jan Templar again on a covert rescue mission to save hostages from new bad guy General Metrac, who uses captured VIPs as bargaining chips. Which isn't very nice.

The backdrop of the game is a new Helghast strategy - following the liberation of Vektar City - to capture southern island bases and use VIPs as leverage.

Beyond the single-player game, we're told to expect challenge modes, co-operative play, and multiplayer options through both ad hoc and infrastructure modes - so online play is a potential option.

What's more, the documentation points to "Gameshare" - i.e. the option to play using one UMD to some extent - as well as downloadable mission packs to follow up on the game's November release.

Expect to see Killzone: Liberation strutting its stuff at E3 this May.