The BioWare Blog announce Mass Effect 3: Earth, following up on recent indications that more content is coming to the action/RPG sequel with news that this free multiplayer DLC pack will be released next week:

When is Mass Effect 3: Earth available?
Mass Effect 3: Earth is available on July 17th for Xbox 360 and PC worldwide. For PlayStation 3 owners the pack will be available on July 17th in North American and July 18th in Europe.

What is included with Mass Effect 3: Earth?
Firebase Rio, Vancouver, and London are available to play on as soon as Mass Effect 3: Earth is downloaded. The new weapons, characters, and equipment are available as rewards inside existing Reinforcement Packs.
How much does Mass Effect 3: Earth cost to download?
Mass Effect 3: Earth is available to download at no additional charge.
How do I get new items in Mass Effect 3: Earth?
As with the Resurgence Pack and Rebellion Pack, new items will be unlocked in existing Reinforcement Packs. Make sure to look out for promotional packs and weekend challenges for other ways to unlock the content.