Wow forever, how do the classes play

I were there so many Moons ago when vanilla release, i played though server lag, saw floating corpse glide across the screen! When the blood plague ran though og i were there...

But since im an old guy i forgot how the classes play, in retail i play as a blood death knight.

But could someone make a quick overview of how the classes will play in forever as i assume it will be quiet different from retail (i know we dont have all details yet but from what we know)