From time to time I am coming back to Sigur Rós tracks and thanks to your post I had an opportunity to refresh it again and realize that they record something new.
Have you heard their newest album, released in April 2019 ? It is called Variations On Darkness
It is a Long Play limited album with only 4, but quite long tracks :) Just launch the A-side on the youtube and it sounds .... well. I am leaving the review for you and I am waiting for it :)