We'll get the prologue early next year, but we might have a long wait for the main course.
Hideo Kojima recently told Famitsu (as cited by Siliconera ) that due to the "enormous volume" of Metal Gear Solid V: The Phantom Pain , that project will require "much more time" than the initial offering, Ground Zeroes .
The latter is being prepped for a spring 2014 launch and it'll be a budget-priced, relatively bite-sized introduction to the new world of Metal Gear Solid . Kojima did say it "would've been better" to release the game all at once but as The Phantom Pain is just nowhere near ready, it unfortunately couldn't be done. Said Kojima:
"If I were to put it in Hollywood movie terms, the prologue, that is Ground Zeroes, would be similar to the first 10-15 minutes that are meant to ‘captivate’ [the audience]. At first, something will happen, then the title will appear like 'bam!' and then nine years later, a big event will be the start [of Metal Gear Solid V]. That’s how the story will be connected."
The Phantom Pain is set in an "immense open world" while Ground Zeroes doesn't feature the same breadth and scope. The prologue will be available for all consoles, but the PS3/360 iterations will be $10 cheaper ($20) than the PS4/Xbox One versions ($30). Here's hoping that aforementioned main course isn't too far off.
Related Game(s): Metal Gear Solid V: The Phantom Pain