Despite the huge clamour for Final Fantasy XV to appear on PC, no concrete information has been forthcoming as to when, or if we will even see Final Fantasy XV arrive on PC. However, during Uncovered: Final Fantasy Xv Hajime Tabata did at least acknowledge the voice of the community.
When speaking with Engadget, Tabata stated that he's "aware of the big call for a PC version", but that "right now we aren't decided, we're still considering a lot of things".
It means that Final Fantasy XV's arrive on PC is likely to be more akin to recent installments, with Final Fantasy XIII/XIII-2/Lightning Returns and Final Fantasy Type-0 HD arriving after the launch of the console versions. The time lag between release has shortened though and the quality of the ports has also improved considerably.
Unfortunately we weren't able to do simultaneous development on a PC and console version for XV. We had to focus on the console version and our goal was to maximize, optimize everything for the HD consoles. Once that's done, then we will definitely take a good, hard look at PC and what we need to do, and consider all our options. But right now we aren't decided, we're still considering a lot of things.
Hajime Tabata, 31 Mar 2016
We already know that Final Fantasy XV is running on some high-end technology and that the studio do have a close relationship with PC development. They showcased some of their work using Direct X12 for their WITCH - Chapter 0 (cry) demonstration.
Once Final Fantasy XV has released, we are likely to hear more about this becoming an actual thing. We started hearing about Final Fantasy Type-0 HD being released on PC a few months after the console launch.