Like an annoying Britney Spears song that you eventually learn to crave until you get sick of it again a few months later, watching the cinematic for the next expansion a few weeks after it was revealed is starting to bring up a certain ... connection I thought I'd lost to Warcraft after the way Arthas' death was handled and everything else that followed in the game's universe.
A short side-story:
When I was 7 or 8 and I came home one evening from my grandparents' house, I remember opening the door, and from our small apartment hallway seeing right into the living room this image displayed on our what was then new computer's 15" CRT monitor:
This was my first ever introduction to Warcraft, an image and event that is burned into my mind forever. Later that night after I'd cleaned up I watched my brother play the first Human mission and all that follows is history; but what I meant to bring up is that all I knew then was that Orcs were the bad guys, Humans were good (OBVIOUSLY!).
I didn't know much English either so I couldn't really understand all the text between missions, thus I could never really appreciate any nuance Metzen might have tried to draw back then in the Orc's personalities other than "I'm green and I kill you" - although I did find them pretty funny when clicking them multiple times ("Stop poking me!").
Some years later, with Warcraft 3's monumental overhaul in storytelling and depth compared to its excellent predecessor, and my own monumental overhaul in comprehension of the English knowledge, I saw Orcs much more differently than how I used to, due in no small part to Thrall's humane character, incredible manual lore and general personalization of all Orcish characters.
... and let's not forget the cinematic that made us care more for Orcs than a Disney movie could:
Orcs were now beings with souls. They had a long history of savage warfare, but also of enslavement. They would have ravaged Azeroth just the same without Mannoroth's blood, but Kenghis Khan was a conqueror too, doesn't mean he didn't have a soul and aspirations (to some degree, the man enjoyed getting laid, who can blame him).
All this to say, when you watch the WoD cinematic again, and if you have the same knowledge of Warcraft's lore and have been with the games for a while, either RTS's and MMO or both, enough to make you feel attached to the universe, you can't help but feel a small swell of pride for Garrosh saying "Times change." to Gul'Dan. It's like witnessing a historical moment, almost being there 20 years ago in the head of Metzen while he was writing WC1.
I dunno how to explain this. I guess it's sort of like J.K. Rowling releasing an alternate Harry Potter in 15 years where Sirius and Dumbledore get saved. Just seeing Grom there, free and with a different future set for him, it just feels geekishly inspiring.