This is why I still hold that this could be true. It was odd to pick GDC as the place to fully unveil the game and its "secrets", no? Normally Kojima would just hold off until E3.
Joakim is a fake dude so I fully expect that he lied. The only thing being revealed at GDC will be the extent that the fox engine has grown (which makes sense for the game developers confrence).
Edit: Hah oops, double post. My fault for not just doing an edit above.