This line says that Kojima Pro first title is for PS4, doesn't talk about the future.
We're years away from the first game ever getting released but I think it being an independent studio and not a first party studio of Sony shows that we'll possibly see a few different things. There's the Respawn and Titanfall thing where they went with Xbox to get Titanfall going and are now making a sequel and another game which are multiplatform. The Platinum route which sees publishers getting games whether exclusive to a console or multiplatform. Finally there's the Remedy outlook where they maintain being third party while making games for a first party like Quantam Break.