I don't remember where i first read about it, frankly.. but apparently i'm not the only one with that impression:Hmm? That was never stated...
http://tech2.in.com/news/gaming/met...-and-phantom-pain-to-be-separate-games/867012At the recent GDC panel, Hideo Kojima has revealed that Metal Gear Solid: Ground Zeroes and Metal Gear Solid V: The Phantom Pain are going to be different games. So far, Ground Zeroes has been set for a 2013 release date and The Phantom Pain will be coming out in the future.
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I'm thinking a early 2014 is more likely, actually.