The fact they revealed and confirmed that The Phantom Pain was running on the FOX Engine answered a lot of the questions surrounding the identity of the game and its origin. I think even though short, that interview was enough for me to get me excited for GDC even more. Kojima will finally reveal it and confirm the final title. But I still think that The Phantom Pain and Ground Zeroes are 2 separate games.
If we go with the conclusion that Phantom Pain is MGS5, I'd find it hard to believe that Kojima would develop 2 big entries in the series at the same time.
I've looked at the HD bits and bobs now too.
I'm still confident he's not entirely "real".
When you remove the flesh areas of his face and focus entirely on the bandages; the lighting, the "texture". It looks like a rendered object.
It's possible to reconstruct a basic facial structure from the shadowing of areas on the bandages. Perhaps doing this would lead to finding out if there's a recognizable face / actor / person beneath?
I swear.. some of you guys. Geez.