2. Revolver Ocelot Is The Man On Horseback
This one should be a no-brainer; in the trailer, we see a man on horseback ride up and rescue Big Boss from a gigantic flaming horse, and surely the only possible character this could be is Revolver Ocelot? While he might not resemble Adam from MGS3, remember how much time has passed, and that it makes sense for Ocelot to now look half-way between his young and old self, broached perfectly between MGS3 and MGS1. Also, remember that around this point in time, Ocelot was a member of the Patriots, so it's quite possible that he was sent under orders of Major Zero to save Big Boss from whoever is after him. Much like the inclusion of Gray Fox, this would be a superb way to expand the mythology and help develop the relationship between Big Boss and Ocelot. Oh, and I miss those hand gestures, too.