Mass Effect 3 is getting a new multiplayer expansion next week with the Retaliation DLC pack. Content will include new enemies, weapons, characters, upgrades, and class kits to unlock. There will be a new ‘hazard’ mode for all existing maps, which adds a variety traps and dangers to deal with. Lastly, there is a new multiplayer challenge feature, which awards points for completing various tasks. These points can be spent on a variety of titles, banners, and other customizations, so you can show off your nerd-cred. The Retaliation pack will be free of charge and available on all platforms on October 9th (October 10th on PS3 in Europe). You can watch the trailer below and find more details at the Bioware Blog.