but if the supposedly leaked footage isn't the end of HotS, then what is it?
What could it possibly be? A huge hoax or an alternate ending to WoL? It can't be the first one because of the legitimate graphics and sound acting, and it can't be the second one because it makes no sense in the WoL storyline.
Face it, the leaked footage is most probably the real, original ending to HotS. Whether they changed it afterwards, we will never know.
None.