It's an Old article but here it is from Insomniac's about 60fps. I put numerous links just to show this was a widely reported story, and that I have no idea which website people would believe, since some websites show bias.
http://www.eurogamer.net/articles/insomniac-60fps-no-more
http://kotaku.com/5393106/insomniac-dev-ratchet--clank-probably-our-last-60fps-game
http://www.joystiq.com/2009/10/30/dev-a-crack-in-time-will-probably-be-insomniac-s-last-60fps-ga/