Originally Posted by
Triceron
I feel like any future classes would have to be 'Hero' classes, since the old method of regular classes leveling through 1-100 would be detrimental to building hype for said class.
People want to take a new class into new content asap. This is what really sold the Death Knight and Demon Hunters, while playing Monk felt like a chore trying to go through all the menial leveling while your friends are boosting through new content and you're trying to play catchup missing out on all the cool new missions and the build up to doing your first dungeons/heroics/raids.
It should be fast-tracked with a unique zone area just like DK's and Demon Hunters had. After that you can progress a bit in the previous expansion (if it makes sense) then jump straight into the new content.