Since the bunker was locked, and many people are sure that it's the point of beginning for Dead Money (apparently, it's in the video as well)...doesn't that gaurantee that the PS3 and PC will be getting the DLC too? Why else would they lock it on anything other than Xbox 360? So that means that Dead Money is a timed exclusive, and not a console exclusive, yay!
Many people have known this, Actually..
FO3 was a timed exclusive, So it would be logical for this game to be too.