In an interview with Infinity Ward community manager Robert Bowling, he stated that there will be no difference in the gameplay experience between the Xbox 360 and PlayStation 3 versions of Call of Duty: Modern Warfare 3.
”No, the experience in terms of framerate, gameplay experience, features, visual fidelity, is going to be the same across Xbox 360 and PS3,” promised Bowling.
However, the Xbox 360 version will get limited time exclusivity on downloadable content, as is the usual for Call of Duty.