I won't repost the video itself but wow.com has a link to some fabulous beta footage of Kalimdor that is well worth checking out if you have even the tiniest curiosity about how the world will look.
WoW Moviewatch the post at wow.com
Muffins Presents: Beta Cataclysm: Kalimdor
Youtube (Part 1 of 2) direct link
Youtube (Part 2 of 2) direct link