Fallout 4 details are FAKE, the reddit user (GNR_Informant) himself admitted. According to the recent update posted by the user on Reddit, he has not proof (about all the Fallout 4 details leaked) because it was all LIE.
Check out below what false details user GNR_Informant leaked about Fallout 4.

• First and foremost, the game will take place in Boston, and be kind of a direct sequel to Fallout 3 with a few groups returning.
  
  
• From what it sounds like, “The
  Institute” is pretty much the downtown DC or New Vegas of this game.
  Boston is going to be unlike anything we’ve seen in a Fallout game
  before, with buildings more on par with cyberpunk and retro-futurism.
• Androids play a big part in this
  game. The railroad from Fallout 3 is a faction. The enemies of the
  railroad is “the Plantation” — a group who force Androids to farm so
  that Humans can get food. The Institute is highly advanced and probably
  obtained or built their own GECK to start a farm.
• Due to complaints about using Super
  Mutants and the Brotherhood of Steel in Fallout 3 excessively and going
  against the lore too much, Bethesda has decided to avoid using these
  groups. Bethesda wants to make a new “race” (think Ghoul, Super Mutant)
  which will be central to Boston. Bethesda is currently looking at
  Lovecraftian fiction since Boston is around “Lovecraft Country”.
• Bethesda has no plans to reinvent
  the leveling up system to make it more like Skyrim and want to make
  Fallout 4 more distinct from Skyrim since of the complaints that
  Oblivion and Fallout 3 were too similar. Bethesda is thinking about
  introducing a system, similar to Skyrim, where your skills can level up
  if you perform certain tasks.

source: Gamepur