Actually, if it is a build up for TDB they very well might do short cinematic. And because the picture is taken from a short video on youtube, doesn't mean it wasnt some unfinished work in progress stuff..
your certainty is oblivious
You can't possibly know that. We might not know anything, but Blizzard sure does. The concept of "leaks" is to get out stuff, that only certain people know of.This is obvious fake because
1. 5.4 trailer isn't out yet.
2. We don't know a thing about 5.5 yet.
I would love to see burning legion things, but it's just fake. :/