Cataclysm cinematic now available
Interestingly, there are no NPCs or characters of any kind visible in the cinematic apart from Deathwing himself (apart from a quick glimpse of what are probably a few goblin or human-looking armorers). You do see some extraordinary landscapes rendered in high-definition glory for the first time — The Barrens, Thousand Needles, Darkshore and Stormwind — and perhaps it's meant as a reminder that the aspect of death was once the aspect of earth and that he hasn't relinquished his power over the latter.
Sorry, gnomes; looks like you're still waiting for a cinematic debut!