Metal Gear Solid 5 has been confirmed by Hideo Kojima himself. Despite Metal Gear Solid 4 supposedly being the last Metal Gear Solid game ever, it appears as if Snake will return for another adventure.
Hideo Kojima spilled the beans during an interview with French gaming magazing IG:
“About Metal Gear Solid 5, I can tell you two things,” Kojima said. “There will be much question of infiltration, espionage, and convincing people to give you ‘a favour’ like in the last Metal Gear Solid. We have not yet finished with Solid Snake, despite the fact that I wanted to let him die at the end of Guns of the Patriots.”
Konami itself is yet to announce the game’s existence although Hideo Kojima humorously mentioned a female public relations officer might carve him up into pieces like a ninja if he says anything more about Metal Gear Solid 5.