From what we know about Fallout 4 so far, it appears that Bethesda has put the majority of their efforts on improving the shooter elements of the game. First of, they Extended the range of weapons significantly and even allow customization of weapons now, which is a clear sign of their new focus on the shooter elements of the game. Furthermore, Shootings mechanics like iron sights and the Overall handling of weapons seem to be tweaked as well. Judging from what was shown to us on their E3 presentation, it really gives the Impression that their main concern was to develop the Action parts o the game. On the other Hand, it seems that the RPG aspect of the Franchise has been toned down alot. Dialogue has been simplified tremendously, skills and character development were streamlined and the freedom of choices is impaired by things like the voiced character or the predetermined history of the Protagonist.