Quests are much more scripted approaching some of the experience I had when on SWTOR leveling (even if there is no choice to do), however, they remain quite classic overall. I have not had the opportunity to go far in the quest for the time (big problems at the moment on the servers), but I can not wait to discover the result and continue my adventure in Draenor!
There are of course many other new / added elements that I will take pleasure to discover! If you played the previous extensions or you're new, I highly recommend you Warlords of Draenor, I take a lot more fun than the last two extensions (probably discovering Outland before the corruption, history and especially the feud!). If you want the best experience, wait a few days because at the moment there are quite a crash / waiting / lag queue.