Mass Effect 3: Leviathan, rumored DLC that was allegedly hidden within the code of Mass Effect 3: Extended Cut, has been confirmed by voice actor Anthony Skordi.
Details surrounding the supposed DLC remain a mystery, but it is said to revolve around a Reaper named "Leviathan". Speaking to Eurogamer, Skordi confirmed that he would be playing the Reaper in the unannounced add-on.
Spoilers for the DLC, found in the source code, pointed to Shepard being sent on a rescue mission to extract a scientist named Ann Bryson. The mining colony she is on has been indoctrinated by Leviathan for a decade now. The traitorous Reaper is apparently able to join Shepard in the war against other Reapers.
BioWare has yet to announce, or even confirm, Mass Effect 3: Leviathan, but we're pretty sure they will announce something at the Sand Diego Comic-Con panel on Saturday. Perhaps they will also detail the recently leaked Earth multiplayer DLC, which Microsoft confirmed will release on July 17th for Xbox 360.