BioWare says Mass Effect 3's Leviathan single-player DLC will be released on August 28 for PS3, 360, and PC.
The developer has previously confirmed that the DLC pack will cost $10 or 800 Microsoft points.
The add-on will feature uncharted systems, new areas of the Citadel, brand new characters and weapons including the AT-12 Raider shotgun and M-55 Argus Assault Rifle, says BioWare.
According to the official blurb: "Mass Effect 3: Leviathan is the first story-driven, single player DLC to be made available since Mass Effect 3 Extended Cut. Leviathan expands upon the events of Mass Effect 3 with gripping and emotional storytelling, compelling new characters, powerful weapons and unique upgrades."
A Mass Effect 3 Leviathan DLC trailer can be admired through that link.