I feel like I am most intrigued by movement in GW2, particularly skills that move the player. I picture a ranger using serpent strike moving around to the back of an enemy and it makes me giddy. Then I picture hornet sting jumping the character back, deep into the enemy lines. Follow this with healing spring (I think it heals over time) and whirling defense (a defensive skill that reflects projectiles). This could potentially break the enemy lines and give your teammates time to do something nasty while they try and respond to your rush. This seems like it can be done with a sword main and axe offhand, leaving a second weapon set available for whatever.
The Guardian had a movement skill and a leaping skill like the warrior if memory serves me well. I'm betting the yet unannounced rogue class will have the most abilities like this and it has been the class I've been most excited about since seen the potential in acrobatics in the ranger.
Thoughts, or corrections?