I'm sure someone has made a post about this before, and if not, woot.
I was looking over the possible race/class combos in Cataclysm an I noticed that the Horde will get one more total race/class combos than the Alliance will. After checking the numbers, I noticed that most of the class numbers were 1 race apart from each other (ie. Alliance gets 6 mages and Horde gets 5. Horde gets 6 hunters and Alliance gets 5).
The imbalance appears to be in the numbers of shaman on each faction.
Horde will get 4 shaman and Alliance will get 2. (Tauren, Orc, Troll*, Goblin vs Draenei and Dwarf.)
It's a small and seemingly unimportant difference, but Blizzard always tries to talk about how the factions are equal and whatnot. I think this is a bit contradictory.
The easy way to fix this would be give the Alliance one more shaman, which would more than likely be the Night Elves or maybe even the Worgen (though, seeing as how Blizzard has not made a race that can have more than 8 classes, I doubt Worgen will see Shaman).
Edit: Shaman Shaman... hurrrr. Fixed.