I'm sure that Shadow Power is an outdated one, and as far as I'm aware of, nothing has changed.
I don't get why they call this one a new video. I can remember seeing it like weeks ago. What are you doing blizz, giving us old videos and news repeatedly?
It's not a new video. Shadow Power is still the same !@#$ty spell they changed it to. They just made this video before the change. I can see why they needed to change it because it was honestly way too good of a spell before, but now it's crap. They could have made different changes to balance it without nerfing it to hell / changing it's effect entirely.