Regardless of your platform of choice, you will be able to play Fallout 4 the very second it releases - if you buy a digital version of the game.
According to a tweet from Bethesda, Fallout 4 will have pre-loading on Xbox One, PS4, and PC. This allows players who have purchased a digital copy of the game in advance the ability to start playing the moment it releases.
Details are sparse, and a precise date and time has yet to be released, but a separate tweet from Bethesda's VP of PR and Marketing, Pete Hines, states that "All should be available a few days before launch day."
It was recently announced that all 27 versions of Fallout 4 have been completed, and are simply awaiting shipment. Fallout 4 releases on November 10.