I have been in touch with the developers of LEGO Minifigures Online, and they have confirmed even with the SteamDB hints that the game is not coming to Linux.
If you didn't see it before, we shared the possibility of it coming.
In reply to my questioning they said this:
Erling Ellingsen, Director of Communications, FuncomHi, Liam!
Thank you for getting in touch.
As of now there are no plans for a Linux version, but we will definitely let everyone know if that changes.
Sad day for LEGO fans on Linux, but it does make me wonder what their Linux entries on the SteamDB page are for. Must just be internal testing that isn't going well.
They could also still be planning it, but could have a surprise launch, or their PR might have it wrong, who knows, but that's their official statement to us on it right now.
We have asked for any information as to why a Linux launcher has shown up, and will update this article if they share information on it.
Update, the PR person also replied to my pasting of the SteamDB page with the Linux info with:
QuoteHi, Liam -
That's very odd, I'll send this over to the tech team.
So, it could very well be a case of the PR department just being out of touch.
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