As someone directly involved with this game I can say you will have success with this theme, considering the game hype and the amount of ppl interested (millions and millions of players).
However if you accept some feedback, I suggest trying Aspire font for subheadings (or even a more standard/traditional - easy to read font).
Example:
Header font is Guild Wars 2 v.1.1, sub-header font is Aspire. I can send them to you if you want.
The fonts in questions are exact replica of the ones used on their official site.
Another detail important for a GW2 theme is the fact that they are using a painterly style, example on how the slider style border should look:
Maybe you can create a mask that will use a similar contour line (outline) as above.
Same goes for the buttons. Oh, disregard the shadow border it is dynamically added by e107.org.
Anyways that's what I spotted at 1st glance that was out of GW2 universe. Hope it helped.