I can see why you are confused. Unfortunately you have to research a variety of sources and piece things together when it comes to the lore of this game. Blizzard really needs to rectify that.

It's in the leader's short stories section of the WoW website:

http://us.battle.net/wow/en/game/lore/leader-story/varian-wrynn/1

IMO it's a great story. I happen to like the way Anduin is evolving. He's a contrast to his father, whose rantings and angry outbursts get tiring. His son is a contrast and as much as the Alliance-Horde conflict adds a much needed plotline to this game I do hope they can resolve it at some point and I think Anduin will be influential. Plus, anyone (such as myself) who has ever grown up in direct conflict with their parents when it comes to values and personality can relate to Anduin. I think they are doing a good job with him.

I don't think Anduin is gay. I have no problem whatsoever with homosexuality but as someone else pointed out, why does the fact that he isn't warlike and desires peace and wants to be a priest mean he's gay? In this day and age, I'd think people would stop thinking in these ridiculous stereotypes. The fact that he wants to be a priest adds an interesting component to the story. If he was a warrior like his father or even a paladin it wouldn't be nearly as interesting.

I think he is set up to be a direct contrast with his warlike, emo father. Both have had horrid childhoods and have lost love ones but they have reacted in completely different ways. One is angry and warlike. The other desires peace and seeks to help and heal others. It's very interesting.

Kudos to Blizzard on Anduin Wrynn. I want to see more of him.