According to a recent post on Kotaku, Red Faction Guerilla (the love child of Total Recall and Mercenaries) is getting some DLC in August.
Selling for 800MS Points ($10), the first of three upcoming DLC packs is Demons of the Badlands, a new single-player story arc that takes gamers outside the boundaries of the main game. There are no details so far on the other two packs.
I love Red Faction Guerilla but with all the games I've been playing, I'm only about a quarter way through it. Looks like I'm going to have to wrap up my single player campaign pretty quick.