He said previously that he was making a Wii game after MGS4, so this isn't a surprise.

Well, there is no real reason for why he shouldn't pick any console.
But I think he may be going for the PS3 again, he already has a pretty good engine for it, and I am sure he would like a chance to improve it ;)

EDIT:

thekitchensink said:
He said previously that he was making a Wii game after MGS4, so this isn't a surprise.

Doh >_<

Man, I wish he's making MGS5 for the Xbox360 just for the entertainment on the forums afterwards.

I REALLY hope its a wii game...the guys a genius

lets see what he can do with the wiimote!!

Hm if it is a wii game, we don't have to really worry about the wiis third party support anymore. Did you see how many titles were announced in the past month april-may.

 Please, give me the list. I want to see.

Wonder what kojima can make on the wii, should be interesting what game he makes on it

Well if you count wiiware it's massive, but if you count just wii games, then it's better than what we have been getting.

The Conduit

The bionic game

Mad World

Valves Project

Renegade Kids project

Konamis Projects (which are suppose to be shown this week)

Battle Rage:Robot Wars? It looks like it could be good.

Of course most of these games weren't revealed yet, but most games on a nintendo console aren't revealed until a month or two before release. Oh and btw these are only official anouncements. I'm not counting some games like SKies of Arcadia where a website known to be correct confirmed it for the wii.

another Zone of Enders on a stronger engine would be sweet. The last one was a nice piece of work.

Forgive me, but that is a really poor list. That's almost as bad as PS3 owners saying "Team ICO Project".

Ask the average person what any of these games are, and they could not tell you. I can't even tell what most of those games are supposed to be. The only one I've heard about is Conduit. WiiWare is obviously the taste of things to come here.