Earth hasn't really been in play during the last two Mass Effect games, so an all-out attack on the home planet sounds, well, pretty different. No word on if it has a bunch of multiplayer in it, which has been quite the popular rumor lately. Either way, the game is expected to be formally announced during the Spike TV Video Game Awards tomorrow night, so we'll probably know more very soon.
Earth is burning. Striking from beyond known space, a race of terrifying machines have begun their destruction of the human race. As Commander Shepard, an Alliance Marine, your only hope for saving mankind is to rally the civilizations of the galaxy and launch one final mission to take back the Earth.