The PlayStation Vita has a problem - it has no games. Sure, the handheld got some excellent releases last year in the form of Gravity Rush and Persona 4 Golden, but it's nowhere near the level the 3DS is at. Third parties are also shying away from the system, so it's up to Sony to save its new handheld.
Sony announced that Killzone: Guerilla will be coming to the Vita on September 17. The title was first announced at Gamescom last year, but we haven't heard much about it since then. The title will be another spin off set in the Killzone universe set after the events of the first title.
The game looks good in the trailer, but the title will have against negative perceptions as shooters don't have the best track record on the Vita. Granted, the two first-person shooters available on the system - Resistance: Burning Skies and Call of Duty: Black Ops Declassified - were both made by the same developer that has now bowed out of console development. Killzone: Mercenary will be developed by Guerrilla Games, the team behind the console titles. That should help allay any fears that the title will be inferior to its console counterparts.
As for specific details of the game, Guerrilla says that Mercenary will have nine campaign missions, each averaging about an hour in length each. Completed missions will offer additional objectives for subsequent playthroughs. Playing into the idea of mercenaries, the game will also reward players with in-game cash in both singleplayer and multiplayer that can be used to buy better gear.
Killzone: Mercenary will launch on September 17 for the PlayStation Vita. The title will be out in Europe on September 18.