Panasonic not to be outdone by sales rivals is pre-announcing the S1H camera to appease video-centric mirrorless users who want that extra edge. It has a 6k mode which will allow for better stabilization and cropping/punching in on 4k timelines while giving the user bragging rights. It has a 14 stop dynamic range spec which if we look at the sensor it is only on a couple of capture settings the rest is 12 bit.
There is also no mention of higher frame rates besides UHD 4k 60p which we presume will be 180fps 1080p max since this camera shares nearly the same internals as the other Panasonic S1 cameras. We do not expect this camera to have better slow motion video than the regular S1 even with its $4000 price tag. The camera looks to be aimed at the mid-high end of the video market and allow it to record without limits which on the regular S1 is 29min.