Some context, albeit simplified: Disco Elysium as an IP and the company behind it (ZA/UM) practically got stolen by some rich investors from the original developers, and most of the original team left or got fired. There were plans for an official sequel of the game, but it got cancelled recently and since then, three games got announced back to back to back by three different studios and have promised to deliver a spiritual successor to Disco Elysium. The companies are:
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Longdue. They have some of the people who developed the original game plus people from big companies like Bungie, Rockstar, but they're also in bed with ZA/UM and are the ones suing the other two companies.
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Dark Math Games. While they do have the most 'game' currently as in their spiritual sequel titled 'XXX Nightshift' has some trailers and a Steam page, there's not that much known about them.
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Summer Eternal. It's a workers co-op studio led by an original games' writer. They have a website which hosts their manifesto, and having read it it's definitely very Disco, would recommend.