Originally slated for a December 2017 release, a Kickstater update from developer Nightdive Studios has revealed a potential new date for the game -- early-mid 2018. Happy news, it is not, but not that much longer a wait when all is considered... if it even is delayed.
Q: What will you be releasing System Shock on?
A: Our goal is to launch on PC/Mac/Linux/XboxOne/PS4 by Q2 of 2018. Not sure if it will be a simultaneous launch, but we’ll do our best.
While it appears the release date has been shifted, it's important to note the use of "by". This suggests Nightdive is anticipating the release could slip -- possibly because of the desire for a simultaneous release.
However, it still leaves the doors open to December for a couple of platforms -- PC, Mac and Linux say -- with a console release in 2018. Or vice versa. Ultimately, the game will take as long as it needs and if Q2 2018 ends up being the date for all platforms, I think we'll find a way to survive.
November Update [Kickstarter]