In addition to still photos, would love to see exposure fusion (or HDR+ as Google calls it) in mobile video too. RED Epic and Scarlet cameras do this with 2 exposures per frame and call it HDRx, I've found it adds about 4 stops of dynamic range in grading. RED doesn't do any fancy anti-ghosting stuff though like HDR+. Magic Lantern firmware for Canon dSLR's also does something similar with dual ISO frames.

This together with 10bit video profile for h265 (think phone hardware is capable now but haven't seen any phones with 10bit video yet) would make mobile video a whole lot better, right now it frankly sucks for anything with high contrast or dynamic range.