From Softpedia - Killzone is, along with a few other titles, one of the key franchises for Sony's PlayStation brand of consoles. Having won over a lot of fans on the PS2 with the first title, the team at Guerrilla Games confirmed, with the PSP title Killzone: Retribution and now, with Killzone 2 already launched and gaining critical acclaim and fan popularity, that things are going great for the series.
But don't think that this means that the team at Guerrilla Games is taking a break, as it is already hard at work on elaborating the first batch of DLC (Downloadable Content) that will arrive in the near future for the Killzone 2 title. Steven Ter Heide, a producer at the company, has talked with GameSpot about the DLC, and how he wants it to respond to the desires of fans around the world.