From Massively :
Storm Legion will open up two new continents for play: Dusken (a horror-themed continent) and Brevane (which hosts the cradle of Telaran civilization). Another major city will join the map, the dual-faction town of Tempest Bay.
Each continent will feature its own storyline, with the promise by the devs that the term "story" will feature far more heavily than mere busy work. The main story of the expansion is driven by Crucia, the Queen of Storms, who's bringing her huge entourage to Telara through the Infinity Gate.
Players have much to anticipate when the expansion releases. In addition to the new continents, the expansion will increase the level cap to 60, add capes to our wardrobes, experiment with a player housing system called "dimensions," introduce seven new dungeons and three new raids, add a crafting tier, and see another Chronicle join the roster. Players will also get to play with four new souls, one for each calling (Warrior, Rogue, Mage, and Cleric). Finally, for the brave at heart, the expansion will bring the immense colossus to terrorize the realms, and these open-world colossus battles are supposed to be like nothing we've ever seen before.
That sounds like a pretty decent expansion tbh. I resubbed to keep myself occupied until GW2, but I'm enjoying it a lot more than I expected.