Killzone 2's first downloadable content pack is coming soon and the official PlayStation Blog has been updated with a trailer and details on the price and date. The Steel & Titanium map pack contains two maps, based off levels in the single-player campaign, but not directly lifted. To quote from the PlayStation Blog:
"Today we can also confirm that “Steel & Titanium Pack” will be available on the PlayStation Store next week (April 30th) for $5.99."
The DLC will also add 12 new trophies to the game.
Check out the PSBlog for more details and the trailer.