According to Kojima, the PC version of the game is currently not their priority at the moment.
Speaking with GTTV, Kojima said his team is currently developing on PC, and will release a PC title at some point.
“Of course we are developing on a PC, so we look forward to releasing something on the PC sometime, but right now we have no release date,” he said. “We are not really looking to do that right now, that’s not a priority.
“We are making it and we hope to put it out [on PC] as well.”
MGS V: The Phantom doesn't have a release date yet, but it will be released on the Xbox One, Xbox 360, PS3, and PS4.