http://www.youtube.com/watch?v=cWaq6Pc8drM

In this video he mentions that there are 6 classes not 4 and that one of them is the warden, a defensive/supportive spellcaster. what happened to that? did they just forget about the warden and the other class or did he mess up and get it wrong?

They originally announced more classes, one of these being warden. They later stripped them down to the current 4.

Ok, guess that makes sense, though it would have been nice to have a support/healer spellcaster class right off the bat instead of twisting the sorcerer into one.

I'm sure they'll release more classes in future expansions