Nothing I have seen of this so far has given me reason to think this will be one of the “good” King adaptations.
From the article, the plan appears to be to make one movie, (and “maybe” more later, presumably if the first pays off). The charm in the series is that it is just that - a huge, sprawling series. Are they going to try to cram a bunch of plot high notes into one movie? It appears that way, as the only detail they have given is that they will not be adapting the first book.
Second, changing Roland’s race eviscerates a large part of the conflict in the second book … well, to be fair, we have no idea if they will even get to that in this movie, or at all, since the one thing we know is that they are not adapting the books in order.
So far they have a pair of actors, and a one-movie script vaguely based, not on the Dark Tower series directly, but on a three-movie and TV-series screenplay adapted from the Dark Tower series (condensed down to one movie with “maybe more” later). Not encouraging signs. Looks exactly like something that has gone through development hell, passed through a lot of hands, and come out looking totally different than its original inspiration.
King himself has no qualms; according to the article, he likes the actors and he thinks this adaptation will be great. But then, Kind thought the musical version of Carrie would be great, and it famously bombed: it is widely considered the worst musical of all time. Evidently, King’s approval of adaptations of his own works is not infallible.