Dicehunter
Resident Newb

A few short hours ago the ravenous fans of the Fallout franchise finally had the long awaited Fallout 4 accidentally confirmed via a LinkedIn profile which featured an artist known as Luis Nieves an employee of the more famously known Guillermo del Toro who we all know from such films as Hell Boy and Pans Labrynth.
Luis Nieves works at Del Toror's company called Mirada in Los Angeles which was founded by Del Toro, Matthew Cullen, Javier Jiminez and Guillermo Navaro in late 2010.
Del Toro's company was hired by Bethesda to create a cinematic trailer for an as of yet unannounced RPG which we we now know to be Fallout 4 thanks to this LinkedIn profile entry.

According to the LinkedIn profile Luis Nieves worked on the trailer for 4 months, No exact information is given regarding it's completion though or even if we'll see it at E3 this summer.
Originally this tidbit of information was discovered by the online publication known as Destructoid who were quickly cited as breaking an NDA and were told to remove all coverage of this story, Although Destructoid along with many other online publications never signed any such NDA making the take down demand fall on deaf ears, Further proving that this could infact be the real thing.
There is also a rumored 20-30 minute gameplay demo which will be shown off at E3, Again this is just rumor but judging by the information so far it doesn't seem unlikely.
Source - Lots of Googling.