Fallout 3 - The Pitt - Previews @ GameSpy, IGN

Two major sites have previews of the second DLC for Fallout 3, The Pitt after some play time at the D.I.C.E. Summit. From GameSpy:

The action actually kicked off at some point after the start of the mission, as I was already on the outskirts of Pittsburgh. A new character named Wernher was helping me to sneak into a slave outpost in order to find a cure for radiation mutation, and he told me that the only way in was to either pretend to be an escaped slave or a slaver that was looking for employment. Either way, I'd be stripped of my weapons and everything in my possession, except for a single pistol or knife that I'd be able to smuggle in (I don't even want to know the specifics of where or how). After crossing a bridge that was peppered with mines, I reached the gate and tried to talk my way in as a fellow slaver. When the sarcastic bastard manning the gate told me that all I needed to do was head inside to fill out an application, I knew I was in trouble.

...and IGN:

If you weren't thrilled with Operation: Anchorage's heavy focus on combat, you'll likely enjoy The Pitt a lot more. There's lots of dialogue, several side quests, and a bigger emphasis on exploration for this second game add-on. There are several different ways you can approach the process of getting into the slave camp. I decided to just walk up and say hi. That didn't go over so well with the slavers. And if you're worried that all of this "saving the day" business is going to turn your evil character good, don't. I found at least one place to be nasty inside of the steel mill. While the slaves sweated with steel production, one slave had carved out a niche for himself. He sells information to his captors as a snitch. Give him some juicy gossip and he'll trade you some stimpaks for the info.