The Mages of Stormwind have done it again, the Stormwind Portal Room has been expanded in Patch 10.2 to support another 10 portals.
This time around, they just opened the doors to the second floor.
With this new update, no further changes to the Alliance portal room should be necessary until 20.0, which should arrive around 2044, when we celebrate WoW's 40th Anniversary.