The lights are on
The wiki states that Mitchell (the doctor who heals you) is presumed to be from a nearby vault, my guess is that the mafia put you out there in that graveyard.
I think they did this in Fallout 2 at New Reno to people they didn't like. I am also hearing that the 2 big factions battling it out will be the NCR and Caesar's Legion.
I have read that they might give the original Vault Dweller's pip-boy but that is just an internet rumor and you know how those go.