According to DSOGaming a fan remake of the first System Shock is in the works:

Citadel is an open-source fan remake of the first System Shock in Unity 5 Engine

I’m pretty sure that a lot of System Shock fans are a bit disappointed after what happened with its official remake. According to the latest reports, this remake now targets a 2020 release. However, we may actually a play a different remake of System Shock sooner than that. JosiahJack is currently working on an open-source fan remake of the classic System Shock game in Unity 5 Engine and has announced that he targets to release a beta version in Q3 2018.

As JosiahJack claimed, this project is now 80% complete and the team aims to release its first version on September 22nd, 2018. Of course nothing is set on stone yet and this fan project may get delayed. After all, it has been in development for a couple of years and originally targeted a 2015-2016 release.

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Thanks Farflame!