You know there has been a lot of heated debate about Evokers since they were announced and it hasn't really slowed down much even after the launch. I have been playing one so far myself and came up with a few thoughts.
I like the concept of Evokers and such but think that Blizzard could have gone a different direction. For instance I would have went the route of games like the Breath of Fire games. I would have made it so that ANY race could have chosen the Evoker class and once you do they could have had their own starting area which would include a temple where you become an Evoker and fuse your soul to that of the Dragons thus empowering you and granting you a portion of their powers. The ability to Transform into a scaled down version of a full Dragon during certain cooldowns, etc. Like using Flame Breath or such.
Otherwise you basically look normal. Maybe you could have Dragon eyes as part of a skin package similar to Death Knights with their undead skins. So the class would be more or less the same as it is now. I would have made the Evoker and therefore dragon theme all part of the class itself.
I would have made the Drakonid race which was already known and established in game more fleshed out. Blizzard is all aboard on the diversity train and showing that women can be just as strong and burly as men in the game. So there you go the Drakonids have that built in already because they don't really show any Dimorphism within their race. Eg men and women are more or less the same builds.
As a Drakonid you could chose to BE an Evoker but you could also be any other class.