Based on this wikia page,

http://fallout.wikia.com/wiki/Fallout:_New_Vegas_cut_content

Those seems to be a large list of things that Obsidian was sadly not able to put into new vegas. Is the content added in as dlc marked on the page originally supposed to be in the original game?

Also, is that a complete list of things cut from the game if not, are there any articles that talk about it

if it is I haven't seen it most were probably cut for a reason so I would guess no