Some of us around CinemaBlend think that a movie or movies surrounding Darth Vader wouldn’t be out of place, it doesn’t seem likely that such things will happen, and even if we do see Darth Vader again, it likely won’t be Hayden Christensen in the role.
The story of Darth Vader has continued in books and comics and those have largely gone deeper into what’s going on inside the mind of Darth Vader.
In Timothy Zahn’s Thrawn: Alliances we see that Vader, even within his own mind, tries to view Anakin Skywalker as a separate person from himself.