Looks to be a prequel to all of the games, as it originates from one of the control Vaults set to open 20 years after it was sealed. Due to the dates seen and the song playing, it's suspected to take place around West Virginia. Not much else known yet; one site says it'll be an online game, but this same site got blacklisted by Bethesda for the Fallout 4 leak.
Apparently Todd Howard's said that the dialogue wheel and voiced protagonist concepts of Fallout 4 were bad ideas, so hopefully that means they won't be making a comeback.