SourceFollowing numerous store listings suggesting a 2015 release date, Bethesda has officially announced that Fallout 4 will arrive on Xbox One, PlayStation 4, and PC on November 10, 2015. It's available for pre-order now on Amazon.
It is good to know that they are getting this game out as soon as they can after announcing it - they have had to keep it secret for 4 years with gamers expectations of an announcement increasing steadily since the last Fallout, so it is nice to see that they want to get it to gamers quickly after the announcement.