I think u must be referring to HDMI 2.0 and not USB 2.0, a typo error there perhaps? And yes, HDR is indeed a big deal when it comes to 4K and PS4 Pro. After I have tested and seen what my PS4 Pro can produce on my recently purchased 4K TV that has HDR support, I was really impressed. Of course the game itself has to be able to support it and I just lucky enough to have one of them, which is Uncharted 4. The graphics and color are so beautiful and realistic, especially on tropical jungle scenery location. For a non-gamer who happens to be around while I'm playing, she also shocked that how come a videogame can look so realistic and even asked whether or not I'm playing a game or watching a movie. I certainly looking forward for more titles to support HDR functionality in future, especially AAA first party titles.