In addition to the film noir talk, we got to take a look at some concept art from the game, including an Elephant adapted as a waste collection vehicle (renamed the Oliphaunt) and the Covenant Engineer, which will be making its first official appearance in a Halo FPS game. We also got to see the early, hideous model of Nathan Fillion's character, Buck, which you can see above. Apparently, Fillion's agent actually cleared it to be included in the game. Thankfully, Bungie did not.
Bungie also dropped the news of the Fourth Wall Studios meta-game within Halo 3: ODST at the panel, which you can read more about right here. And, finally, there was Connor. Check out images from the event in the gallery below.