According to Gamespot, with intel from a anonymous insider.
“Power struggles between Kojima Productions and Konami have convinced the publisher to make drastic changes, including amending the employee status of its Metal Gear team. Some senior staff at the studio, including Kojima, now essentially work as contractors, not permanent employees.
The person explained that, once the Phantom Pain project is finished, in all likelihood the management at the studio will disband.
“After we finish MGSV, Mr. Kojima and upper management will leave Konami. They said their contract ends in December,” the source claimed.”
Kojima….had a hard life