Are you saying the hardware in the iPhone 5 is capable of 60 fps?
The 5 has very similar camera hardware to the 4S. The latter, under iOS5, was capable of half-vertical-resolution recording at 720p60 (bu not under 1080p). This feature was taken away in iOS6 - that is, no 4S can record at anything over 30 fps under iOS6 any more. (See
THIS for more info on the halved vertical resolution;
HERE is an article on iOS6's removal of this feature.)
I assume the iPhone 5 (along with the 4S) will only support 720p60 (at halved vertical resolution) just like under iOS5, not 1080p. The hardware is just too slow for 1080p60 (or even real, non-half-resolution 720p60). One can still hope there'll be a miracle and Apple took away 720p60 in all iOS6 versions because the iOS5 implementation was substandard and the hardware could have been capable of far more - but, as a programmer knowing the sensor reading isn't particularly fast (as opposed to, say, Nokia's sensors), I don't think this is the case. That is, I don't expect much from current models (4s / 5) and certainly not true, full-res 1080p60.