MGS4 confirmed by kojima

http://kotaku.com/gaming/go307/feature-talkin-metal-gear-with-hideo-kojima-248695.php

he said: "The PS3 is like the theatre, it's a little bit high-priced but it has to be high quality as well. The 360 is a DVD, it still needs to be high quality but you need more variations, while the Wii is almost like a TV channel, because every game you have it with your family".

and then he finally said"But like I said, MGS4 is aimed for the movie theatre, it's aimed for the PS3, so the game's scenario and graphics need this theatre-type hardware. It's when a producer has a game that can work on the 'DVD level' that a game will go multiplatform",