1.) Snap/PIP feature
Some people are divided on this feature claiming that they do not need to do two things at once. However, Xbox One's Snap feature isn't really about doing two things at the same time. It's more about just keeping tabs while you're playing a game or watching a movie.
I was telling a friend about how I think it's cool that's you could watch a video clip and play a game simultaneously. In all honesty, I won't be using it to play Fable and watch The Walking Dead at the same time. It would be particularly useful when I want to reference a video guide on YouTube when I am stuck on a game.
It would certainly help if PlayStation jumps on this as well.