I will go out on a limb and say dalaran wont show up in 5.4
And the reason is it will be just too much work for the devs to stick a huge ass city anywhere in the new world especially near org
Can you imagine the lag having a horde capital plus a sanctuary city right next to each other
Maybe it will be eluded to in a book but dont expect to see it show up
Thats my two cents anyway and if im wrong may a thousand virgins jump up and down on my cock