I actually did post a census (unscientific) in that thread. Granted, it ain't official, but I'll bet it's pretty close to accurate. Unlike Live, anyone can do this - go online at the time you usually play, and start doing /who all x x (no dash). (OK, don't everyone do this at once and crash the server, hokay?) Do it for 1-10, 11-20, 21-30 - and see who's online while you're playing. Won't do you any good to know that there are a boatload of Rogues at the high end, but NONE when you're online at 6 in the morning Euro time or whatever.
Me? A Ranger on Live was my highest character, and I started a Paladin and 'Chanter here. But, guess what? I got bored with both, and started a Druid, instead. Close enough to Ranger to make me happy, and will probably let me solo for a bit longer. I won't be heartbroken if I don't get guilded and go raiding, 'cause I don't have much time for that anyway. Heck, I may start a Ranger, too. They're really my favorite.