Okay guys. After brown townyzing the trailer carefully, I've formulated a theory for the trailer's meaning.
The dog wanders into the house in the beginning, and almost looks like it's there for a reason, or as if its following something. It flashes back to a young mother and a father leaning over their baby's crib. Keep in mind that the father has darker skin, and black hair. Back in to the present time, the dog walks up to the crib and pauses briefly. We then see the dog dash out of the house and down the street, with pre-war flashbacks still occuring showing people frantically scrambling for their vaults. We see the dog run across the bridge and up the hill along with the pre-war civilians. Then, it shows the same mother and father with their child as the bombs fall, while they are waiting in line to enter the vault. The dog runs to the vault door, and it is a horizontal one that acts as sort of a hatch, if you will. The dog runs across the wasteland, still acting as if it is determined to find something... or someone. We see the dog walk through the Red Racer auto shop, and we also see a man with black hair and darker skin, maybe late teens to early twenties in terms of age, walking down the road. The dog reaches the man, and the man seems very happy to see him, almost as if they know each other. The man appears to show affection to the dog very early on. They travel together throughout the rest of the trailer
Now, my theory is that the man is the baby in the pre-war flashbacks, and the vault that the dog went to was his vault, given the clip where he comes outside of a horizontal vault door. The dog was tracing his scent to the vault, then catches up to him outside the auto shop. The dog is the family's dog before the war. Now, as you probably noticed, the colors in the urban environment are very vibrant and colorful. Some say that this is long after the war and that society has had time to rebuild, but I disagree. I think it could be exactly the opposite. Things have not had time to deteriorate for 200 years, so they are still in relatively good condition (for a nuclear fallout, that is). This is why the assumed protagonist (the vault dweller) is young, because it has been around two decades since the bombs fell, so things have not had time to sit and rot.
TL;DR: The game takes place 20-ish years after the war, the baby in the flashbacks is the protagonist, and the dog is the protagonist's family's pet from before the war.
What do you guys think?
Poll