MRC and Sony Pictures, which is releasing the film, have committed not just to financing a pilot but a full run of between 10 and 13 episodes, depending on how the scripts and story arcs develop. The Dark Tower show will begin shooting in 2017 with plans to premiere it in 2018, ideally around the time the film becomes available on cable or streaming services.
Elba has signed on to appear as older Roland alongside Tom Taylor, 15, who plays Jake Chambers in the film. That duo will serve as the framing device for the show’s central story, which takes place many years before the events depicted in the film. Since the series will be Roland’s origin story, a younger actor will be cast to play the aspiring gunslinger as a teenager, back before the realm of Mid-World “moved on” into chaos and bloodshed.
McConaughey’s involvement is a possibility, but not locked in. His character, Walter, is a semi-immortal who wields powerful, ancient magic and is a major element of Roland’s origin as a six-shooting knight, but in King’s books this sorcerer often takes on different names and appearances.
So, the character will be in the show, but he may be inhabiting the shape of another actor.
For more info, head over to EW