It's a joke video. Not meant to be serious at all, and the effects are just supposed to be a joke based off of all those stupid frag videos on youtube.
Also,
http://www.youtube.com/watch?v=PstCqUghr9s
This isn't completely Cataclysm related, but I've actually made a 2nd account via RaF link and upgraded it just so I could get that fancy rocket (http://www.wowhead.com/item=54860) on my main account.
Hoooray.
Troll starting zone is god-tier. Really fun.
Too bad I won't be playing until Saturday, which is when my friend is coming back from vacation to level with me.
That's pretty much it, sadly.
Elemental Attacks....
Maintenance....
New world.
EDIT: If you start Blizz Launcher, the new login screen/cinematic is up. Servers still down for a few hours, but hey.
Spoiler'd for size