Metal Gear Solid: Ground Zeroes is the prologue to Metal Gear Solid V: The Phantom Pain. The action happens 9 years before Phantom Paine in 1975 in Cuba. This game along side with Phantom Paine will be the last entry in the Metal Gear series done by Hideo Kojima. To bad that this is exclusive to consoles cause I played Metal Gear Rising on the PC at the start of this year and it was awesome.
Bellow you can see the release date: