Hideo Kojima and Staff showed the world first ever footage of MGS4 at TGS 2005 with a nine minute trailer. Afterwards they exhibited a realtime demonstration off the development kit to prove that the trailer was indeed not a CG but actual PS3 graphics.
This is not the trailer but the exhibition of how the popular MGS4 trailer showed at this years Tokyo Games Show was realtime being played off of the PS3 Dev kits. This video is a living proof that PS3 Dev kits created the MGS4 trailer. This is a english fansub translation of that presentation which is happening in Japanese. Enjoy