It's co-produced by Arca.
The Icelandic artist shared "The Gate," the first single from her still-untitled upcoming album, earlier this week. Now we know that record is coming in November thanks to the New York Times, who featured the LP in their fall music preview. They also reveal that it's co-produced by Arca, who also worked on Björk's previous album, Vulnicura. It'll come out via One Little Indian, and Björk has referred to it as her "Tinder album."
One Little Indian will release the untitled new Björk album in November 2017.