One of my favorite WoW information sites, Armory Data Mining and its related blog, has now been updated for patch 3.3.3. We've profiled the site here before, but if you're not familiar with it, it's run by a fellow named Zardoz who trawls the armory assembling statistics on race, class and spec popularity. He also gathers information on class battleground performance and professions.
From what I've seen, there haven't been any giant changes between the patch 3.3 and patch 3.3.3 data (you can find the former at the profile link above). Paladins are still the most popular class, followed by death knights, druids, priests and warriors. It's well worth a look if you're interested in seeing what WoW's statistics look like right now.