The new trailer and gameplay videos for Mass Effect 2 did not constitute the entirety of Mass Effect-related reveals at E3.  Speaking with Joystiq, BioWare honchos Greg Zeschuk and Ray Muzyka confirmed that an announcement of the second batch of DLC for the original game, Mass Effect, would be coming soon.

Joystiq reports that the DLC is already playable, stating that Muzyka was playing it at the BioWare offices shortly before he left for E3. 

So far, all we know about the content is that it will be more combat based, and will involve some sort of fighting arena setup.  As a huge Mass Effect fan, I’m eagerly awaiting the second DLC pack, and I hope it proves a bit more substantial than the single mission provided to us by the “Bring Down the Sky” pack.