I think this one is official:

Over on the official Japanese Konami website, there's a webpage that is nothing more than the image you see above with text that reads "A Next Metal Gear Is ...". Nothing special, except for the fact that this lil' teaser site is done in "signature" Xbox 360 green and that the weird exclamation point math problem includes a picture of a power button that could be seen as similar to the 360's ring of light. Of course, Konami is keeping quiet to what the website is all about, but we'll give some advice anyway: Don't get your hopes up.

http://www.konami.jp/kojima_pro/mgst/?ref=kjp_jp

It's been posted a few times, but don't worry I didn't see the others when I posted this as well .... lol

It's a remake of MGS1-3 to test the market. IF the games are successful (which they probably won't be) then multiplat MG"will be considered".

Deja Vu!!

Oh and the exclusive is a zune game.

How many times today are we going to see this? To be honest with you it does look like it is hinting at a 360 game. Would it really surprise anyone to see MGS4 on 360?

OMG I want MGS4 on Xbox 360...

Not that I would get it

just to sit back and watch the fanboy wars.

That would be really cool, but you may be reading a little too much into it...

If it comes to the 360, looks like i wont regret changing my games consoles

As someone mentioned in the other thread it says the 'next' MGS. So it's highly unlikely to be MGS4.

MGS5, if it is indeed in production, would be at least 3 years away. Would Konami really announce that now?

I think it's more likely an expansion like title (ie. Substance) or perhaps a new title for PSP/Wii/iphone.

Although strange things have happened in the gaming industry.