A few days back Sony announced a Killzone 2 DLC Steel & Titanium Map Pack for the PS3.
Over the weekend, it appears to be confirmed that the map pack will be free, and will be downloadable on April 30, 2009.
Roughly translated via http://tweakers.net/nieuws/59547/sony-kondigt-multiplayer-uitbreiding-voor-killzone-2-aan.html:
Sony Computer Entertainment has announced that first person shooter Killzone 2 new multiplayer game fields receive.
The expansion in the Netherlands made PlayStation 3 game from April 30th for free download.
More PlayStation 3 News...