Thanks to some investigative journalism by Kotaku writer Jason Schrier, a solid idea of the existence and details of Fallout 4 are coming together.
This is of course a timely revelation, after it emerged that the “Survivor2299” saga that occurred recently, in which a cryptic website and ARG teasers appeared and led fans down the rabbit hole, turned out to be an elaborate hoax.
According to the exposé on Kotaku, documents which detail certain scripts, casting calls, and choice lines that indicate that this is indeed a Fallout -based project. “War. War never changes” is listed as a line in an opening monologue, which is of course an iconic Fallout line.
References to Fusion Cores, and Commonwealth Minutemen all but confirm the universe. Of course all signs point to this being real, but it should probably be taken with a grain of salt when it comes down to the small details.