Hmmm... Remember how we saw both Donkey Kong and Peach in screenshots before they were officially announced, only to have them introduced in a few days? I predict tomorrow's update will finally give us Snake's profile on the Dojo.
I can't make out the text very well in these other two pictures, but it looks to me like the Colonel is briefing Snake on Mario (his target?).
http://www.famitsu.com/event/tgs/2007/__icsFiles/artimage/2007/09/20/con_tgs2007/mg0013.jpg
http://www.famitsu.com/event/tgs/2007/__icsFiles/artimage/2007/09/20/con_tgs2007/mg0014.jpg
(edit: just links, because they don't seem to appreciate me stealing their bandwidth..)