Let's get the bad news out of the way first: the Killzone 2 Steel and Titanium DLC may not be free after all. It's not official yet, but a recent post on the US PlayStation blog does say that "the price for this map pack is still TBA". Of course, the "TBA" here could still turn out to mean "free", so let's keep our fingers crossed.
The same post also showed off some videos of Wasteland Bullet and Vekta Cruiser, the two new multiplayer maps included in the pack. Check 'em out below. The Steel and Titanium DLC will drop April 30.