According to details provided by Square Enix, the PC versions, also known as the Windows Edition, will support up to 8K resolution (native 4K), HDR10 and full support for mods, something that is a big thing in PC gaming. The game will also feature an all-new dungeon, gear, and bosses, first-person mode, plenty of DLCs and more.
As far as system requirements are concerned, Square Enix says you'll need "at least" an Intel Core i5-2500 or AMD FX-6100 CPU, Nvidia GTX 760/1050 or AMD R9 280, 8GB of RAM and over 100GB of HDD space. These will get you 720p resolution but we do not know which graphics settings. In case you are looking for 1080p, system specifications raise to recommended Intel Core i7-3700 or AMD FX-8350, Nvidia GTX 1060 6GB or AMD RX 480 and 16GB of RAM. These will work on Windows 7, 8.1 and Windows 10 64-bit OS.
The recommended system specifications for 4K HDR gaming are a special thing as these will need Windows 10 64-bit Fall Creators Update, due to HDR, Intel Core i7-7700 or AMD Ryzen 5 1600X CPU, same 16GB of RAM and a Nvidia GTX 1080 Ti. Strangely, no AMD graphics card is given although you should be good with RX Vega 64, at least if AMD gets the driver optimization right.
The game will get also get special benchmarking software on February 1st, which may give a score and show how well the game will work on various system configurations.
The game will be available for pre-order on February 1st on Steam, Origin and the Windows 10 Store, each offering certain bonus content. The game will officially launch on March 6th.