If you go to PEGI's website and look at the game ratings for Final Fantasy games, you'll notice they have a rating label for Final Fantasy VI on PC. If this is to be believed, Final Fantasy VI is to follow after Final Fantasy V into coming to Steam to be a playable PC port most likely based off the mobile phone ones. If you fancy playing FFVI right on your PC and the visual styles are to your liking, I would definitely keep an eye out to see if there is any chance of this coming to PC soon.

Source Article:
Final Fantasy VI PC Listing Spotted - GameSpot