It turns out that Ground Zeroes will be a downloadable title for the Xbox 360, Xbox One, PlayStation 3, and PlayStation 4. The Xbox 360 version and PS3 version will be $20, but the next gen versions (Xbox One and PlayStation 4) will be $30. Although each version of the game is technically the same, the "next gen" versions do feature increased graphics, and the Microsoft releases include an extra mission as well. In this extra mission, you play as Cyborg Ninja Raiden who has somehow jumped into the past. Although it isn't clear if they'll somehow work this into the story or not, the trailer (as seen below) implies that it is just a cameo mission with no relation to the actual plot.
Metal Gear Solid V: Ground Zeroes will be released on March 18, 2014. For more information, check out the brand new "Microsoft Exclusive" trailer.