The folks at GameSpot followed up their earlier "Trials of Atlantis E3 2003 Preshow Report" with a more detail article about ToA. After catching a demo of ToA this latest write-up, "Dark Age of Camelot: The Trials of Atlantis Details", provides a look at what ToA has in the works, such as: graphics, graphic changes for the old world DAoC, monsters, number of zones, boat and shark transportation, pricing for the expansion and other points of interest. Below is a snippet from the article, follow this link to read more:

A boat system will be added to the game, allowing you to reach the point from which you can enter the Atlantean regions. We also saw a player character riding atop a hammerhead shark, which apparently will be the equivalent of the horses that are used for rapid transit in the rest of the world. Not all of the new creatures are aquatic. We saw some ugly-looking harpies guarding a forbidding island, for example