"Could this be the rumoured Metal Gear Solid game that Miyamoto is working on?!"
Well, like people have said, it isn't rumored- it's official. Also, Miyamoto isn't working on it, he's just the one that mentioned it in an interview.
And I'm equally as pissed that the XBox gets DDR. It's OBVIOUS it's a heavy Japanese style game that most XBox fans just won't like- at least with Nintendo fans we already like Japanese style games and are much more open to a game like DDR. Jesus- Konami's gotta undestand that taking bribes for games that won't sell is STUPID.
"I don't think they would have footage of the game already, and if they did, I don't think Nintendo would allow them to show it off, we all know how secretive Nintendo likes to be with their games. "
Most developers don't announce games at the beginning of the development cycle- they usually announce them a little into it. I'm sure Konami has at least the ability to show footage of MGS for the Gamecube. Also, Nintendo couldn't do diddly squat to stop Konami from showing footage- Konami's a 3rd-party.