http://www.pcgamer.com/final-fantasy-15-will-have-steam-workshop-support-and-will-run-on-older-pcs/
There's also a bit about SLI causing issues in the article.
He also confirmed that the Steam version—it's launching on Origin too—would have Steam Workshop support, making it easier to share and add mods.
The system requirements are still being figured out as optimisation work continues, but Tabata confirmed that it won't be locked to 30fps, though 60fps will be hard to achieve at max settings. "Supporting it will be possible, but considering the spec you'd need to get that level—with native 4K, HDR, and a good 60fps—the machine we've got here couldn't do that at the moment. That's a GTX 1080 Ti, and even with that 60 frames is not possible."
On a more positive note, a broad range of machines should be able to run the game. PCs that have similar specs to current gen consoles won't have any problems, so if your PC is a few years old, you shouldn't need to splash out on an upgrade just to enjoy Final Fantasy 15. Unless you want to run it in 4K, that is.
This also opens the door for future Final Fantasy releases on PC, that aren't an afterthought. "If my team were going to be in charge of the next Final Fantasy game, we probably would set up the basis of development on that high-level PC architecture—I think that's something that we'd do," Tabata says. "But looking into the future, you have to consider cloud-based games—the answer might be different depending on how far down the line we're talking about."
Ultimately, Tabata and his team hope PC players will see that they're taking this very seriously. "I think this is for us a great opportunity in getting the game out to the PC market that the latest Final Fantasy game is serious about the PC market and its players. We're taking on that challenge with everything we've got and it'd just be great to get some kind of feedback on that, players' reactions and understand what people are expecting towards our game."
There's also a bit about SLI causing issues in the article.