Plot details for some new DLC called Omega for Mass Effect 3 has been found in the disc’s text files.
The summary can be seen below – beware of spoilers:
Aria tells you that Omega is now under a blockade from Cerberus. Since a direct attack didn’t work, Cerberus is now trying to starve Omega into submission by blockading supply ships coming in through the regular Omega relay. The level’s appearance will change to reflect this – the Afterlife has gone quiet, the music is off, the flashing lights are gone, maybe a soup kitchen has taken over the dance floor. Aria requests that you steal into the blockade and board the command ship. Take down the blockade so Omega can be resupplied.
As punishment for breaking the neutrality pact, Cerberus launches an attack against Omega. The enemy is attempting to destroy Omega’s shields, which will allow asteroids and meteors to smash into the station. You must repel the assault and ensure the shield remain operational.
The Omega title of the DLC pertains to the Omega Station, which is a floating space station from Mass Effect 2.
Mass Effect 2 DLC character Zaeed Massani, meanwhile, is referred to as an enemy for the upcoming downloadable content pack.