What do we know about Metal Gear Solid V: The Phantom Pain's Mother Base thus far? Not a whole lot. We had an E3 presentation that contained parts of it, but not really anything concrete yet. Anything else is pure speculation.
And pure speculation is what this video's all about! Although, I have to hand it to the guy -- his analysis seems well-thought-out, and probably spot-on in a lot of cases. But, we'll have to wait until sometime in the (hopefully) not too distant future to find out.