While some news in relation to Kojima Productions' collaboration with PlatinumGames', Metal Gear Rising: Revengeance is expected to hit Monday, one thing is certain: It's not the announcement of a PlayStation Vita version.
A supposedly leaked internal document form Sony Computer Entertainment America lists the game as a PS Vita release (alongside logos for Call of Duty, BioShock, and Final Fantasy X HD Remix, to name a few), but after being quizzed on the subject on Twitter by Sal Romano of Gematsu, Sony's Shane Bettenhausen confirmed the entire document is a hoax.
So, there you have it. As of right now, MGS Rising is not on Vita. But if Konami wants to change that, I should say I am indeed up for it.