The Cataclysm cinematic has just become available, and -- words fail me -- it's amazing. Some folks behind the scene here think it's Blizzard's best yet, but personally, I think it's a dead heat between this and the Wrath of the Lich King cinematic.
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!