Sure. But let's use that as an example:
Here is a press kit image.
"Woah, that's just a reskinned Draenei!" Sure, I guess. We can put aside that this is a completely different order of modification from the supposed leak's stone dwarf or direhorn reskin, but sure. It's just a Draenei.
So let's ignore that Draenei reskin altogether, and the reskinned grub. What do you have?
-Brand new faerie mobs right there.
-Brand new plant-pod doodads.
-Brand new swirly trees
-Brand new glow bushes
-brand new frond plants
This is my issue. That is what appears to be missing here. You can pause the DF or BfA feature trailers at any frame and there is some new architecture, or new doodads, or new creature, or new and interesting trees visible. Here, even if we assume these are "bad" pictures taken from a much better trailer, we have four different scenes with seemingly little to nothing new.