After much waiting, the time has finally arrived. Patch 1.12 will be deployed on US realms during Tuesday's maintenance (and presumably on EU realms during Wednesday's maintenance). The maintenance has been extended by two hours to give time to apply the patch, so it should start at 3:00 AM PDT and end at the usual 11:00 AM PDT. However, in addition to the extended maintenance required for patch 1.12, a number of realms will be coming down tonight at 11:00 PM PDT for hardware upgrades - to come back online with the rest of the servers when maintenance ends on Tuesday. Servers coming down early for upgrades include the following: Aggramar, Argent Dawn, Arthas, Azgalor, Bleeding Hollow, Bloodhoof, Burning Blade, Burning Legion, Durotan, Earthen Ring, Elune, Eonar, Eredar, Gilneas, Gorefiend, Kargath, Laughing Skull, Lightning's Blade, Llane, Lothar, Magtheridon, Malygos, Mannoroth, Medivh, Shadow Moon, Shattered Hand, Skullcrusher, Stormrage, Thunderhorn, Thunderlord, Warsong, and Zul'jin.
Update: Further proof that this is, in fact, a roll out of patch 1.12 is the fact that the public test realms have been closed.