Players will be warned that their OS or hardware will not be supported by the game’s launcher starting today, with the system changing to support higher levels of Direct3D on January 15th, 2017. All subsequent versions of Windows (Vista, 7, 8, or 10) will still be supported, and if you’re already running a high-end card on Windows 10, it’s likely you won’t even notice the change. Those still running on older hardware will most definitely notice the change and should probably upgrade their machines… or start playing on console. Either one.
Source: Official Site; thanks to ThatLanteshGuy for the tip!