This site works best with JavaScript enabled. Please enable JavaScript to get the best experience from this site.
I'd just like to chime in and mention that the underground place we see in the gameplay movie is Tristram Cathedral.
Check the screenshot on the main site:
http://www.blizzard.com/diablo3/world/dungeons/tristramcathedral.xml
Now, I don't know about you, but Tristram Cathedral sound like begining of the game to me. It was in D1 at least