Metal Gear Solid Rising Will Be Available On Playstation 3 From Release.

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When asked if the game would come out on the same day as the 360 he responded "yes, that's correct."
[quote]
"I think the difference between our approach in our press conference and our competitors' is that our focus is on exclusive content," Dille said. "When a third party comes on our stage, it's because they have something for our audience that is exclusive. And so whether it's the Assassin's Creed demo where Assassin's Creed [2] might be cross platform, what we're doing with the [weapon-unlocking] functionality between the PS3 and the PSP is a point of difference."</blockquote>

And he's right aswell - 35% of Microsoft's press conference was devoted to games coming out on the Playstation 3.