Go Pro Hero 4 Black samples have been hitting the net and included are 1080p 120fps tests. The quality seems much better than what the Hero 3 black was able to do in 720p but it is below what 1080p 60 can deliver on the same cameras.
Hero 4 Black slow motion Samples:
It’s confirmed, the Hero 4 has no 720p 240fps mode like the PetaPixel release claimed.
The camera however does offer a 240p mode in the WVGA mode at Ultra Wide Setting With just 848*480 pixels 16 by 9. Not enough resolution to reach HD but good to have over standard VGA.