First off, can't wait for TGS next week. Really have my fingers crossed for a big announcement. I really can't wait any longer, I'm going crazy. I must be going crazy to be looking for any clue I can (seeing as how Kojima is the type to drop them EVERYWHERE ...)
I read this crazy theory. What is going on with Kaz' involvement with Cipher / Zero? Is it possible that the Big Boss we know is actually Zero?
Now, this could be totally coincidental. But again, Kojima likes us to pay attention to small details. I am not claiming that the "Big Boss" we know in the trailer is Zero, but entertaining any possibilities are just for fun at this point in time. Before too long, we'll know exactly what he's up to.
Remember, this is JUST AN IDEA. I am not claiming this to be true. My point is that right now, anything is possible with Mr. Kojima. Notice there is no scar on this TPP rendition of Big Boss.