Ok, so I don't usually do this, but... Do you even look before you post? This EXACT video is posted in a topic just two topics down from yours, and has nearly the exact same title. You basically just copy and pasted that topic. And there's another topic near it that is about leaked map editor footage also.
1.) Don't post duplicate topics, especially pointless ones 2.) Yes that's map editor footage, and it's been out and known for months 3.) There's more footage also, like this: http://www.youtube.com/watch?v=5B-ZbDyxz0s