Previously on The Dark Tower adaptation news: Sony is planning a series of films based on Stephen King’s epic fantasy series, with seasons of an ongoing TV series in between. The film, directed by Nikolaj Arcel, stars Idris Elba as Roland Deschain/The Gunslinger and Matthew McConaughey as the Man in Black; it is not an adaptation of any one book in the series but rather both a sort-of sequel, spinning off from the fact that the final book has a storytelling twist that the film can really play with… (this article kinda explains it).
And now… According to Entertainment Weekly the first season of The Dark Tower TV show will be based on Wizard And Glass, the fourth book in the series. Idris Elba will appear as The Gunslinger but he may only feature as a framing device or narrator for flashbacks to events taking place. The story takes pace when Deschain – the gunslinger – is a teen, so presumably the show will be casting for a young Deschain.
Similarly, the EW article suggests that the Man in Black may also appear in the show but, “he may be inhabiting the shape of another actor”. The Dark Tower movie director Nikolaj Arcel and co-writer Anders Thomas Jensen will provide at least some of the scripts for the show’s 10 to 13 episodes, although they will not be serving as showrunners.
The possibility of further films/seasons of the TV shows depends entirely on the success of these first two. But if there is more to come, Stephen King himself suggests that the franchise could draw upon Marvel’s The Dark Tower 2007 comic book series on which King served as creative and executive director.