Almost no game that say that they are 60fps run at that frame rate unless explicitly told otherwise (remember Titanfall). ND themselves said that UC4 will be 60 fps but there will inevitably be dips. inF: SS's framerate varies between 30 and 60 and the same holds true for KZSF (especially in MP).
Its still a step up from last gen where most games ran at 20-30.