What are some ruins, either ancient or recent (.i.e. Auberdine, Theramore) you would like to see rebuilt and resettled?
I think it would be pretty cool to see a rebuilt Eldarath, possibly as a more official capital for the Highborne and night elf mages. A thousand year hatred of arcane magic can't exactly be undone in a few years, especially for such a long lived race.
I think a Darkspear-controlled Zul'Gurub would be cool, maybe have the Darkspear pacify the other tribes and slowly integrate them into the city.