I've played all the RTS games and WotLK but I'm somewhat ignorant of the new lore (though I have skimmed through the wiki to try get a base idea), but since most of the point of divergence seems to be "higher level" so hopefully I should be fine sticking to just what was depicted in Reign of Chaos for Dalaran

EDIT: By the way, how many "creative liberties" could we take, particularly given its an alternate timeline/universe? I.e. a lot of the characters that would be important to the story of Dalaran i.e. members of their council have rather barebones, unclear, or even conflicting lore.