Lead Designer Cory Stockton tweeted last night that Blizzard hopes to get Stormwind repaired during patch 6.0's lifetime. Stormwind was destroyed during the cataclysm and Deathwing's onslaught. Ever since the place has had its fair share of ruins scattered about the city. In Mists part of the bridge and entry way leading to the Alliance hub was fixed, but that's all the progress that's been made.
@Vigilate_MW We hope to get to it during 6.0.- Mumper (@mumper) June 6, 2014
Personally, I'm thrilled. Seems all the NPCs working their butts off to fix Deathwing's damage finally accomplished something. Good on them!