The Dark Tower is one of those unfilmed Stephen King novels that seemed doomed to forever languish in development hell. But the wheels are finally turning on a movie version – with Matthew McConaughey and Idris Elba now officially attached in leading roles. The news was confirmed by King himself, via his official Twitter feed. (The initial tweet was posted at 9.19am local time – a sly Dark Tower reference – although he then had to delete and re-post at a somewhat less significant time, after misspelling Elba’s name). The news comes as no major surprise; it was reported at the end of last year that McConaughey had been offered his pick of roles. Elba was then sought for the role of the gunslinger Roland Deschain. McConaughey, it appears, has opted for the darker, more mysterious part of the ‘man in black’. Nikolaj Arcel (A Royal Affair) is attached to direct the film, which previously had J.J. Abrams and Ron Howard in the director’s chair. (Howard is now producing.) The adap