The Dutch site - Tweakers.net - that reported that DLC for PS3-exclusive, Killzone 2, would be free has now published a retraction... to the surprise of few but the chagrin of many.
"Update, April 14 10:32: Sony Computer Entertainment has Tweakers.net indicated that the extension will not be free to download, but an unknown amount will cost. Indicates that the DLC would be free, as mentioned earlier was not from Sony and is not correct", reads the
update.