If you've done the live event you know that Gnomeragan city isn't fully reclaimed. And if you've been keeping up wtith announcements, Zul'Gurub is no longer a raid.
This makes these two prime candidates to be reclaimed in cataclysm around level 35 after rinishing quests/instance quests and becoming capitals after level 35.
Would be really cool, Atterrall homecoming of the Trolls to stranglethorn vale, they retain their base in Durotar, and Echo Isles is still the starting zone, but you get a a racial story progression for those 2. Once you complete the quests, the city zone becomes phased into a capital, with flight points and AHs, vendors and trainers.. gives the two zones some life after you've gone past those levels rather than fading into the past where you never really return except with a new alt. And gives Gnome and Troll lovers some joy.
kinda nice too, gives the horde and alliance both 3 cities on eastern kingdoms and the horde vital city in the south even though it is only active after level 35 if you've done the quests. Would also be the closest horde city to Vashj''ir. As for gnomergan , that could be fun too, deep run tram extended to its base station, Gnoemragan always kinda reminded me of final fantasy 7 city, iguess it was the train. but yeah..
Would be nice. Later on, they can add a movie and events to the reclaimed city, but for now all they neeed do is add a phase and organise the zone as a city.