This is a new live-action trailer for Mass Effect 3. Because an expensive pre-rendered one last week wasn't enough!
Kind of wish it had stopped at the collapsing roof. The "end of the world" stuff from the perspective from Joe on the Street is a neat angle to show a bombastic sci-fi game from, so to then have to cut to a Shepard being assaulted by poor computer effects undermines it a little.
Ah well! The game's out on March 6 on PS3, PC and 360. Which is soon!