I'm on my phone so I can't post the links but kotaku and ign have received leaked casting calls and scripts from the game. Although the game isn't mentioned in it the line "war. War never changes"
Is present which makes it obvious that this is gonna be fallout. The game is also set in Massachusetts like rumors said (which were actually correct surprisingly!) I know it was somewhat obvious fallout 4 was coming but after the heartbreak that was the survivor 2299 site, I hope this mends some broken hearts. Hopefully we get a glimpse of this thing soon.
Here is the ign link but I can't hyperlink it, sorry lazy people.
And here is the original kotaku one