La Steam page of Disco Elysium still reports the release date of the game as "to be announced", but the ZA / UM developers has just reposted an article that predicts as more optimistic time window the end of this year.
The features of the game had been published on the 1 May on Canard PC. Today, ZA / UM posted a translation on theirs Steam news feed. Although most of the article describes the key aspects of the title, there is also a brief mention of the release date.
The fact that the developers have translated the article without any modification or correction suggests that the date indicated is plausible. Or maybe we're not such good detectives, just like Disco Elysium.