I think the safe(vault?) is more indicative of Fallout 4 than the barbed wire "4". It looks more like an "F" than a "4" to me anyway.
Also, the guy who hosted thesurvivor2299 (he goes by the name DCHoaxer on Reddit) said that he was contacted by Bethesda, and short after the site was updated to say 12.27.13. Coincidence? I think not.
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Source?
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[url=http://www.reddit.com/r/Fallout/comments/1scis2/uhm_hello_im_the_prick_behind_thesurvivor2299_ama/]It's somewhere in this Reddit thread.[/url] There's no way to link the actual post, so you're going to have to do some sifting.