Today the release date for the KillZone 3 Steel Rain DLC was announced. It will be released in Europe on 4/5/11 and America will get the pack on April 12th (that sucks). The content is 4.99 but  Playstation Plus members get it free for the first month the content is out. About 6 months ago I posted a post about the perks of Playstation Plus check it out here GadgetU. The map pack will include 2 new multiplayer maps Junkyard and Stahl Arms.

Source: KillZone