Kojima @ GDC 2013: FOX Engine & Ground Zeroes + Phantom Pain = MGSV

[NoCtiS_NoX]

Yup there is two games.
Ground zero will take place nine years before Phantom pain.
Ground Zero will be the prologue.

http://www.siliconera.com/2013/03/27/the-phantom-pain-and-metal-gear-solid-ground-zeroes-are-two-separate-games/