The Eredar, as a neutral faction (ones that refused to go along with the whole demon thing). Tauren haven't had much going for them, I mean they're around and doing stuff, but it always seems like the story rarely touches on them. Although I hate them, the gnomes could use some more focus, as well. I want them to move away form the Orc vs. Human thing they've got going on, it's been done to death.