Arenanet has provided some Guild Wars 2 info on one of its Professions: The Elementalist.
The Elementalist channels natural forces of destruction, making fire, air, earth, and water do her bidding. What the Elementalist lacks in physical toughness, she makes up for in her ability to inflict massive damage in a single attack, dropping foes from a distance before they can become a threat. Yet, despite her incredible offensive potential, versatility is what makes the Elementalist truly formidable.
Rather than swap weapons to adjust to new situations, the multi-faceted Elementalist quickly adapts to new threats by attuning to different elements as needed. When the Elementalist attunes to any of the four elements, she receives intrinsic bonuses that continually empower her.
Basically you play like Aang of Avatar: The Last Airbender but you can kick even serious butt. This character can use any of the four elements: earth, wind, fire, and water.
As proof, below are just a couple of skills this Profession can use: