The Echo Isles is being completely redone in anticipation of the pre-cataclysm content patch, and it looks amazing. It'll be an early look at the Cataclysm storyline that will more than likely give some neat flavor items (kind of like the events leading up to the release of Naxxramas 60) like perhaps tabards or pets or toys.
This will obviously be a Horde only quest zone, as the Alliance will be busy reclaiming Gnomeregan for the Gnomes.
It only took 5 years, but the Trolls will finally have a capital city of their own! How the Echo Isles will play a part of the actual Cataclysm expansion is unknown, but it's right on the ocean, so perhaps it'll act as a gateway to some of the new underwater zones. Wait and see!
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