For the record I firmly believe that MGS 4 is a prequel and takes place before the events of MGS 1. But if it is not a prequel and in fact is the sequel to MGS2:SOL than my money says that Old Snake is Big Boss and Young Snake is the Snake we know and love. How would Snake be so old if he was born in 1971 as part of Le Enfante Terrible thing along with Liquid Snake. Maybe the FOXDIE has aged him perhaps, but the ''real Snake'' is clearly shown at the end of the trailer leading me to believe that all is not what it seems which is not surprising considering that this is MGS we are talking about. Oh and if you haven't figured it out by now Raiden = Grayfox's clone IMO. In the end we'll have to play the game to know whats going on for sure...duh.