Not 60… But as far as I have seen, the Alliance seems to be “better” at grouping and organising pvp (and ganker) raids\groups. Its hard to do quests at feralas, winterspring, plaguelands etc… Cause there will always be atleast 2 Alliance lvl 60`s killing questers\farmers every 15-25 min.
Hordies are probably more players, but i do not think it can be much more than 55-60% horde.