So, here's one idea (don't know if it's already possible): use advanced bracket on MLV recording (new 4K capabilities).
This feature would be good to do HDR images that was not possible before due to object movements, such as portraits.
The idea is just like video recording, but limited to a number of frames, and doing brackets between then (like -4 to +4 f-stops). The container could still be MLV.
What you all think? I think it would be great especially for portraits in places that has a good amount of light. Of course, it would not work (although would speed up the process) if your scene has low light, since it would be necessary to up the shutter speed and, therefore, the bracket would take too much time to freeze speed objects.
Just one more idea, together with the other one
posted some days ago.