I agree with you that the shots in previous trailers immediately pan to very interesting locations instantly
i just also think if you went to one of those videos and maybe took a still shot of some random location or of mobs fighting... it'd look pretty similar
im not saying this is real, just saying that this could easily just be ill-timed or random panning shots over the zone and we aren't really seeing the 'meat'
i doubt heavily that the opening pan for the desert zone would open up to random harpies and beard ogres fighting you know?
I also doubt that the legion trailer would've opened in Highmountain with random tauren fighting a drogbar in a dank cave somewhere