I recently purchased a camera that is capable of shooting 4K UHDTV video which I used to capture a cliff diver in Mazatlan last week.  Each frame is the equivalent of an 8 MP still image which means I can step through action footage and extract a pretty decent photo from exactly the moment of peak interest. I predict that sports photography as it is done today will be forever changed by this new technology.  I hope to post the full video sometime next week.