So I have been watching the e3 demo again, pausing every so often to see what I can find, just before the red menace game is shown you can see a couple other of what look like tapes, seems one Is labeled "your new assignment" which has me thinking that you are sent out into the wastes for a reason, or at least you were supposed to be, but then something (hidden experiment) went wrong and everyone died and you stayed under for 200 years.
Something bad must of happened because if the vault was closed successfully then why are there dead bodies lying around like the one you get your pipboy from?

Could this all tie in with the main story at all?
But then what happened to your family?

Since he pulled the pip boy of a vault staff member I think it was that persons log.

O.o huh... yeah that would make sense.
still gotta wonder what the assignment was, might of been the hidden experiment?
And I'm still curious how everyone died.

That is not impossible, time will tell.

Yeah I suspect that whatever was saved on that PipBoy wasn't meant for our character to see by the big bads.

Vault Tec up to no good

That message probably isn't for your character, since you weren't issued a Pip-Boy. I'm guessing that message is the first clue that points you in the direction of the MQ.

At E3 Todd hints that some drama takes place in the vault. I'm too lazy to look up exactly how it phrases it, but after watching the bomb going off he says something to the effect of, "You survive the blast and are lowered into the vault. Events transpire, but you then emerge 200 years later."

While 'events transpire' may have referred to the war, it sounded to me like what happens in the vault before you become a vaultsickle will be the major driver of the story.

I imagine it belonged to the person who was originally wearing it, yes. The Assignment is probably his/her assignment to the vault and duties therein in the vault. Like a little background of what the Vault's purpose was...was there an experiment in play...Was it actually meant to save people...etc

I concur with others that the Pipboy message is for the person you took it off of. I keep saying in some of the theory threads that we get clues to what happened in the vault after going to sleep from terminals, but it could be that we get the info from the Pipboy.

Yeah that's what I thought, since something must happen to your partner and child, plus the skeleton of the scientist on the floor makes me think they died suddenly rather than of old age.
I suppose it could tie into the whole child thing people keep bringing up, that your child "may still be alive because why would they generate one based off your couple" who knows

Nice find though, I haven't seen this pointed out