Metal Gear Solid 5 will be coming to PC and Steam. The original report appeared on the official Konami UK website where it said that MGS V will be released on PC and leaked ahead of the MGS V live event. But the link was removed and it was screen captured by a NeoGAF poster.
Image source: Computerandvideogames.com
Metal Gear Solid 5 was only supposed to be released on PS3/PS4, Xbox One/Xbox 360. The other previous Metal Gear Solid titles that were released on PC are Metal Gear Solid and Metal Gear Solid 2: Sons of Liberty, and they were first appeared on Steam.
Platinum Games' Metal Gear Rising: Revengeance, has also launched on Steam, while Metal Gear Solid 5: Ground Zeroes was released last March for the consoles and the follow-up Phantom Pain doesn't have a release date yet.