Metal Gear Solid V: The Phantom Pain may be launching early next year, if a downloadable content advertisement is any indication.
According to a post on Reddit, those who register Metal Gear Solid V: Ground Zeroes will get access to DLC, which is presumably related to The Phantom Pain, "Early 2015."
Bear in mind that Konami has yet to provide any specific release information on The Phantom Pain, so take this report with a grain of salt. Also don't forget that Kojima Productions isn't afraid to delay a game if it needs more time, so the wait could very well be even longer.
Fortunately, franchise fans will have Metal Gear Solid V: Ground Zeroes to hold them over at least a handful of hours when the game launches later this week.
