I am pretty new to GW2, but I have been playing MMOs for years. I think one more race and an accompanying profession would do the game a lot of good.
The race, mainly because I think there are too many humanoid races. Human(duh), Norn, and Sylvari are very human in the profile. All Asura have going for them are being short with big heads (as far as being drastically different in profile). Charr do a good job of offering something really different to play.
My vote would be for Tengu: they look different enough, and have a lot of mystery surrounding their current status in the world. I love the Kodan, and would love to role one, but again, they are too humanoid.
To go with Tengu and their seeming Japanese cultural inspirations, I would propose a class with heavy samurai influence. It could wear heavy armor, making the armor balance 3/3/3 like the developers seem to want.