The new Hideo Kojima game on PC will after its release in PS4
It will be something completely new.
Hideo Kojima has signed a deal with Sony to make a game exclusively for PlayStation 4, but ultimately this title will not stay only in the Sony platform and end up coming to PC.
PS4 first, then PC
Yes, the compatible version will be launched after the PlayStation 4, which will have a temporary exclusive on the console. They have made it clear that in addition to there first, will also be an exclusive PS4 consoles.
Taking this opportunity, Kojima wanted to clarify that this is a completely new production and that has nothing to do with Metal Gear or with Silent Hills, brands that still belong to Konami.
Moreover, the game will be developed by Kojima Productions (study that is independent of Sony), but Sony will offer support and all the help they needed.
Finally, they have stressed that this is a timely agreement between Kojima Productions and Sony, so future games Hideo Kojima could reach other platforms.