MGS4 isn't a rumor, I'm gonna have to go digging to find a link to an article stating it wont be an exclusive. FFXIII simply stated it wasn't an exclusive, but not the console it could also be on nor if it will be a direct port.
VF is a huge series in japan and almost as huge in America, if you were god at VF3 you were the god at your local arcade until you were dethroned. If they still play it in Tougeki, its still a big series. Heavenly Sword isn't a PS3 buyer, I don't see a mass load of people wanting a PS3 for mainly Heavenly Sword, I personally don't see whats so great about Heavenly Sword, looks like a game I could beat in one day and get bored with it the rest of my life.