I remember someone saying that the Draenei from Warcraft 3 were retconed and later changed to look more like the antagonist of Warcraft 3. (they looked like the ones at the right if im correct)
I like their appearance, they and the blood elves and the night elves would be my first race choices if I ever started to play WoW.
Trinity Force could be anything, It could represent Bards mask (the three dots), it could represent ultimate balance in the cosmos and it could represent the ninjas. Ether way, it follows the Triforces role as a very important artifact.