They say there will be a druid class, too
I'm afraid, we'll have to wait 2 years or even 3, who knows... SC2 was announced a year ago. Still in development. BTW, if memory serves, they are planning to release SC2 this summer-winter.
Probably, D3 will take them 1,5-3 years, too.
WitchDoc looks prety much like a Necromancer. That wall of zombies was a freakshow XD
Diablo Evolution now has a lot of job =)