According to two french blogger of "GameKyo" named Ribery and Theclad, the website of Kojima can easy announce a New sort of CO-OP game, revolutionnary, with the New Metal Gear !
Because of three new letters on the Kojima Production Next Project.
There is one C, one O, and one P.
So there is CO-OP.
We can imagine that the first player use his PS3 to control Snake (Big Boss) and the second player use his PSP to control the new Ninja (Raiden/ Gray Fox)
According to the same member called Theclad, in reality the Soldier Ninja will me more famous with the name "Sunny" very related with the Website "NEXT" from Kojima Productions, because the Sun erase Clouds ans rains.