According to a little leak by the Konami Europe site, Metal Gear Solid V: The Phantom Pain and Metal Gear Solid V: Ground Zeroes will be coming to the PC and Steam.

Interestingly, the main page clearly shows the headline of TPP and GZ coming to Steam but clicking on them results in a page not found message. Meaning, it is probably in your best interest to stay tuned to the upcoming live stream. You know, the one that begins in about 15 minutes from now? Chances are the news and details will be officially revealed there.