Spotify doesn’t currently provide any info as to when an upcoming album will be released or even if there’s an upcoming album at all. It would be awesome to add upcoming albums to the artist’s homepage with the expected release date. See Apple Music screenshot.
Hey! Looks like your idea is growing up fast and it's amazing! We are going to change its status to 'Good Suggestion' now and we hope it continues being supported by more and more users. Thanks again for your suggestion. We really appreciate it 🙂
More information about how the Spotify Idea Exchange works can be found here.