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In about April 2019, it was rumored to release May 2019, in the US. (May 17) As of right now, it's currently available to stream on VOD platforms. It's playing in only one theater that I know of, in San Francisco, CA, one showing per day. Not sure why it didn't get a full limited run in theaters. I do know though, I spent almost a year waiting, and several days searching for it on VOD. The only place I've been able to find it is through Amazon Prime Video; for about $6 to $8. (You don't have to be a Prime member to rent it.) Update: It is on Netflix in September 2019. Edit
The film is extremely faithful to the book, to the point of including large sections of dialogue, but alters in one significant way: Charles does not die. Instead, he appears after the fire and begs Constance to let him in, but grows angry when she will not answer the door, after which he leaves and never returns.
The only other significant changes is that the final section after the fire takes place over the course of six weeks, rather than only a few days as it does in the film. Edit