"Weve also redesigned our progression system to work with challenges rather than XP. There are over 1500 increasingly difficult challenges to complete in Killzone: Shadow Fall multiplayer, so youll have plenty of opportunity to prove your skills and collect rewards. To increase longevity even further, we plan to continue support for the title well after launch and yes, DLC multiplayer maps will be released free of charge to ensure everyone can play."

Well thats interesting they are releasing the DLC for free :O