Just had a thought about something else Kojima might be trying to say with this game. No doubt others will have noticed the connection but I've not kept up with the whole thread and I'm feeling kinda smart and wanted to post this anyway lol.
You see all the sea life on the tank, and the black oil gushing out. In the first trailer the black oil handprints and it bubbling up from under the sand was a prominent feature too. I'm guessing this oil seems to be harvested from living beings to power machines. Now of course real oil as we know it is the ancient remnants of past life on Earth that created oil over billions of years. So my thinking is that this game is definitely going to be talking about climate change, and probably some kind of take on the fact that we have been expending all of this locked away energy, energy that took billions of years to foster, now being used up in a matter of generations, and of course unlocking tremendous amounts of past carbon dioxide that had been locked away allowing our climate to remain stable. There also seems to be a clear theme of everything, past present and future being connected too, I think an allegory of the entirely closed ecosystem that is our planet and climate.
I'd be staggered if this wasn't a big part of what Kojima is trying to say with this game here the more I look at it. Then of course the military complex which has brought ruin to us all is the one harvesting all of this life for energy purposes which of course will be another element to the story too.
God I cannot wait for this. I'm so glad he's done with MGS actually, the backstory in MGS seems far too deep and convoluted for me to delve into when I've not completed all the games. It's actually pretty cool we get Kojima unshackled and creating a brand new narrative. The fact it looks and sounds fucking incredible is just beautiful icing on the cake.
Also, even with Scorpio around the corner I think these Sony first party games (more or less?) will be punching the PS4 way above it's weight and not give Sony much to worry about. They're doing incredible stuff with the hardware, yes even on base PS4 when you see games like Uncharted 4.