The Steam version will feature Steam Trading Cards, Steam Achievements, full keyboard and controller support, and an extensive list of legendary creatures and characters, including Sephiroth, Balthier, White Chocobo, and Glow Moogle.
The following is the system requirements as seen on the Steam Store Page
There's also a day one edition that is available if you purchase the game prior to Nov 28 but it only gives you a soundtrack sampler and a wallpaper - the price is unknown but it might be the same as the standard edition.
Source 2: https://venturebeat.com/2017/10/31/world-of-final-fantasy-is-coming-to-pc-via-steam/
Source 3: http://www.pcgamer.com/world-of-final-fantasy-announced-for-pc-release-date-set/
Source 4: http://store.steampowered.com/app/552700/WORLD_OF_FINAL_FANTASY/