MGS4+ Oxide for the 360.
The game is non existant, it goes to show you that those who believe, will believe anything. Why do I say this? Because your source is a random Twitter account. I could go make one right now and say some random made up E3 bullshit and people will believe it.
People will always go "well you never know", your right, we won't. You should only believe something if the company announces it, not some random twitter crap.