In a press release, Konami announced some details regarding the distribution of Metal Gear Solid V: Ground Zeroes.
Metal Gear Solid V: Ground Zeroes will be released for PlayStation®3, PlayStation®4, Xbox 360 and Xbox One in Spring 2014. The boxed Playstation®3 and Xbox 360 versions of the game will retail at £29.99/€29.99, whilst the digital releases will cost £19.99/€19.99. Digital versions of the Playstation®4 and Xbox One will retail for £29.99/€29.99.
This confirms that Ground Zeroes will indeed be a separate release from The Phantom Pain, although they might be bundled together when that part of the game comes out.
Some additional information from the press release:
METAL GEAR SOLID V: GROUND ZEROES charts a rescue mission as users infiltrate a Cuban prison camp, and sets in motion a series of events that culminate in the stunning plotlines of METAL GEAR SOLID V: THE PHANTOM PAIN. The prelude showcases key advances to the series made possible by its use of Kojima Productions’ FOX Engine, with a large open environment, and missions where time of day and weather have a dynamic effect on the game and its missions. These elements will play a vital part in the story set up in METAL GEAR SOLID V: GROUND ZEROES, while familiarising users with the possibilities they offer ahead of METAL GEAR SOLID V: THE PHANTOM PAIN.
To read the entire press release, follow the link below.