Nightdive Studios are confusing me a little, but they are now at least making a Linux demo which will have a closed beta period.
You can see their Steam forum post here. They stated later they are now doing it as they have heard us. Mac apparently is a lower priority as Linux has been in higher demand.
Initially they stated they don't know when the new System Shock will have a Linux release, then it was pointed out in a comment that no one at Nightdive Studios uses Linux, and now they claim one person does have a Linux machine.
I'm a little dizzy from that, different answers from different people in a small studio.
In the end, I just hope it has a proper Linux version and it works well as I do want to play it.
You can find their Kickstarter for the new System Shock here. They are well on their way towards hitting the 1.1million dollar stretch goal for the Linux version.