I am sorry for the necro but I believe I have figured out a vital part of this games plot! I have been sitting here looking at pictures of "Raiden" from the trailer, and Raiden from MGS4. Also, I have started to look back at Gray Fox from MGS1. The trailer at the end says "Raiden, is back." and Kojima has released an image for this new game of Raiden (wearing the same outfit he wore in MGS4) riding Crying Wolf. He was not wearing that ARMOR from the new trailer, or wearing the eye bandage. Using the similarities to different characters, I have deduced that The man who (looks) like Raiden is ACTUALLY Gray Fox! HE IS BACK! Here is why:
LOOK AT PICTURES LOL!!!!
also, Gray Fox was stepped on in Metal Gear to the point where he would need full body ARMOR to be fixed. And the red dot on Gray Fox's helmet is right where that Bar-code is on the character from rising. Raiden will be in the game in his outfit from MGS4, and Gray Fox will be in armor, because he was stomped into oblivion by a huge Metal Gear. WHAT YOU THINK? Plus as an afterthought, Raiden was TOTALLY fixed at the end of MGS4. so........yeah what do you think?