Apparently, the Cupertino giant will include a 120 FPS “Mogul” feature to the Camera app to enable users to play back recordings as slow-mo films. This will, of course, require some hardware upgrades too (a better camera and a faster processor).
Shooting video at 120 frames per second allows for much more detail to be captured in a given timeframe, compared to regular recording speeds, such as 30 FPS. Footage recorded at 120 FPS, then played back at normal speed will, therefore, appear slowed down.
Check out the butterflies in the video embedded above for a glimpse at what the upcoming iPhone 5S might be capable of doing.