On Twitter, Kojima talked a bit about the idea behind the new Metal Gear that can be seen in action in the Metal Gear Solid V: The Phantom Pain launch trailer.
“Its replica of Sahelanthropus. MSF had Pangaea Ultima motif, but also the motif of this world oldest human species. Once back to skull, you climb up the evolution simultaneously.”
“By walking upright, humans started using tools, got heavy & advanced cerebrum, & voice(lang) for communication by getting respiratory tract.”
“To forward to the new world, u need to stand up. It’s not homage to Tokusatsu/anime that MG becomes to walk upright.”
“2 yrs ago showed cutscene of Sahelanthropus walks upright to del Toro & he liked it. he also noticed Argonauts homage.”
Metal Gear Sahelanthropus
Source: Hideo Kojima Twitter