While im on, ill chip in my two cents on how the game should end/be continued with dlc. I'm going on the indoctrination theory, which im sure you've all heard. Most ideas here are Shepard waking up from his indoctrination, then heading up the beam again and basically repeating the process with more choices and EMS effects. Doesn't that seem like the game is just saying, "oops lets try this again". Its insulting, and although I wouldn't mind a similar conclusion, it has to breathe new life in the game. I mean, if we want a decent size dlc, it can't be a rewritten last 10 minutes of the game.
Shepard wakes up from the rubble in the streets, and his squad and Anderson is either dead or alive depending on EMS. Seems pretty basic so far right? But the reapers have closed the beam to the citadel. Maybe because they arent stupid and just gonna leave the back door to their destruction open, again. So after some reaper troop fighting, or a cutscene, shepard makes his way back to the base. This could maybe be an opening to use Anderson as a squad mate if your died. He did have a lot of powers in the first level. Anyways, shepard returns to the Normandy and must make a new plan to get on the citadel. Liara, or someone who survived, remembers the conduit on illos from mass effect 1, the true back door to the citadel. I'm don't know if it was confirmed to be destroyed in mass effect 1, but im sure bioware could find a way to bring it back. I mean, they brought in a dang prothean. So Shepard could have a decent hourish long mission to illos, war assets could assist you, and a final battle with harbinger ect ect. basically, I just wanted to say that maybe Shepard should'nt just run through the beam in london. It just seems too obvious.