https://www.pcgamer.com/system-shock-enhanced-edition-update-adds-4k-and-official-mod-support/

While we wait on Nightdive's remake of System Shock—due in 2020—the studio has given us the next best thing: a new version of the classic immersive sim that runs in 4K, has an adjustable field of view and extra keyboard rebinding options.

The new features arrive in a free update to System Shock: Enhanced Edition. It already offered graphical improvements on the base game plus basic mouselook support, but the latest update—called the 'source port update'—adds so much more, including new hi-res assets and smoother camera movement. You can read about all the additions here.