World of Warcraft: Cataclysm Zone Previews

The official World of Warcraft website has been updated with previews of Mount Hyjal and Vashj'ir, two new zones that will be introduced in the forthcoming Cataclysm expansion pack. I'm a sucker for underwater dungeons, so here's a bit about the latter:
Vashj'ir is a level 78 82 zone in World of Warcraft: Cataclysm where players will be called to explore the depths of the Great Sea and stop the naga from seizing immeasurable power from the realm of Neptulon the Tidehunter. This expansive underwater zone will feature an unprecedented fight for survival against the naga overwhelming the area, several new quest hubs -- including Alliance and Horde naval ships and submarines -- all-new underwater travel and combat mechanics, several pocketed undersea caves free from water's grip, two new five-player dungeons (Throne of the Tides and Abyssal Maw), and the first-ever opportunity to explore the remains of the once-majestic city of Vashj'ir!
Oh, and if you're feeling wealthy, you can now buy a $25 celestial steed from the Blizzard Store. And that, folks, is the highest priced DLC to date.