Swordplay would be cool for a mesmer-type profession if it were magic enhanced.
Like a feign death sword skill where you faint and lie there, but if the opponent attacks your body, it phases out revealing it was an illusion, and you soar up from the ground behind them, launching them into the air.
I am also really hoping that skill mimicry and stealing is present somehow in GW2. It was such a cool thing because its use dynamically changed depending on factors outside your control. It was a very involved form of redirecting skills that required a player to be very conscientious of others abilities.