All we've seen of Metal Gear Rising Revengeance at present is just a single trailer, but some already seem to be speculating on framerates. Hideo Kojima may have just put any framerate worries to rest.
Tweeted Kojima early morning America time (he's currently in America): "The old Rising that was being prototyped at Kojima Productions looked visually like Metal Gear, but it was 30 frames per second and required complicated controls. I made one request of Platinum: 'A cool Raiden who moves nice and smooth at 60 frames per second."
In a separate Tweet, Kojima touched briefly upon why the original Rising project was cancelled and switched to the Plaintum Rising. "When entrusting the next title to the Kojima Productions staff, I'm always told 'For the fans, it's no good if it's not the director's Metal Gear.' [The Director meaning Kojima]. This isn't the case, though. Saying 'If it's a spinoff can it bit done?', I entrusted the old Rising to the young staff. However, I feel certain that if their Rising had been released to the world, there would have been many people who felt, 'This isn't Metal Gear.'"