I doubt it will be WD, I heard too many people !@#$%ing about them (myself included). I'm not actually saying he's bad, I just think most people will like Barbarian, Wizard and Demon Hunter more.
The least played class was the Witch Doctor, so I got no clue why everybody things its gonna be a popular class.
I myself cannot fking wait to lay hands on the wizard and try out the spells after level 13.
But as soon as i make an alt it's the barb next.
has had Barbarian as the top class.
WD has always, ALWAYS been at the very bottom.