It's been pretty dead. As it usually is before an expansion.
I've been playing Star Wars: The Old Republic (trial) and really enjoying that. Seen more people active on those servers than I have on WoW in a loooong time. And I don't really like Star Wars. But man. The cool espionage-type story for my Imperial Agent is SUPER COOL. If you find yourself in that RPG mood and you're interested; I totally recommend it.