POTENTIAL SPOILERS AHEAD. Mass Effect 3 could get a new piece of downloadable content revolving around a Reaper named Leviathan, according to files extracted by a BioWare forum poster yesterday.
According to the files, which were extracted from yesterday's "Extended Cut" DLC and dumped on Pastebin, you'll have to rescue a scientist from a colony that is under the control of a Reaper named Leviathan. Leviathan has apparently broken free from the rest of the Reapers to do his own thing.
One purported line reads: "So a Reaper goes rogue and kills one of its own. That's what we're looking at here, right?"
Another: "If Leviathan is a defector -- a Reaper that broke away from the others -- then it is also a traitor."
I contacted BioWare for comment this morning and received this statement: "We don't comment on rumours or speculation. There will be news about more DLC coming soon…"