Following multiple leaks, Konami has confirmed that Metal Gear Solid V: The Definitive Experience is releasing on October 11 in North America and October 13 in Europe for PlayStation 4 and Xbox One, priced at $49.99 USD. A Steam version is also coming on October 11, but further details are TBA.
The Definitive Experience includes Metal Gear Solid V: Ground Zeroes, Metal Gear Solid V: The Phantom Pain, Metal Gear Online, $20 worth of Mother Base currency, and the following DLC:

Ground Zeroes Missions

Déjà Vu
Jamais Vu

The Phantom Pain Items

Weapon: Rasp Short-Barreled Shotgun Gold
Weapon: Maschinen Taktische Pistole 5 Weiss
Weapon: Adam-ska Special
Weapon: Windurger S333 CombatSpecial
Shield: Personal Ballistic Shield (Gold)
Shield: Personal Ballistic Shield (White) Shield: Personal Ballistic Shield (Silver)
Shield: Personal Ballistic Shield (Olive Drab)
Costume: Fatigues (Black Ocelot)
Costume: Fatigues (Gray Urban)
Costume: Fatigues (Blue Urban)
Costume: Fatigues (All-Purpose Dryland)
Costume: Fatigues (Naked Snake)
Costume: Sneaking (Naked Snake)
Costume: Tuxedo
Costume: Sneaking suit (The Boss)
Costume: Jumpsuit (EVA)
Western Tack (for D-Horse)
Parade Tack (for D-Horse)
Cardboard Box (Rocky Terrain)
Cardboard Box (All-Purpose Dryland)
Cardboard Box (Wetland)
Bionic Arm Gold
Emblem “VENOM SNAKE”
Mother Base Staff (FOX)
Mother Base Staff (SKULL)
Mother Base Staff (CANINE)
Mother Base Staff (HOUND)

Metal Gear Online Items

EXPANSION PACK ?CLOAKED IN SILEN...