Windows and PS4 huh? As the exclusive owner of Macs and an Xbox One, that's little irritating. I'd at least imagine a Windows to Xbox One port to be reasonable.
"It will be released on the PC and the PlayStation 4 on January 26, 2016. The game will come to iOS some months after that, and other platforms a bit later." (http://the-witness.net/news/about/)
Fingers crossed for a Linux port at some point! For Blow's last game (Braid) I think the Linux port was done by a third party.
Or maybe it's time to get a copy of Windows and set up a VM with GPU passthrough...
http://arstechnica.com/gaming/2015/09/how-sony-snagged-jonat...