Seeing as the trailer for Mass Effect 3 already has Earth in flames and ruin from the Reapers, I'm going with everyone else on this one. At the very least, the Reapers will arrive at the very end of the DLC. Of course, that sort of raises the question of what to do with you saved game after you complete this DLC. Can't really run around the galaxy doing whatever while your home planet burns...perhaps the message, "You can play, but it's not part of the story."