The affected realms are: Balnazzar, Bloodfeather, Darksorrow, Defias Brotherhood, Earthen Ring, Frostwhisper, Genjuros, Haomarush, Hellscream, Laughing Skull, Lightning's Blade, Magtheridon, Neptulon, Nordrassil, Quel'Thalas, Ragnaros, Ravencrest, Runetotem, Shadowmoon, Shadowsong, Shattered Hand, Silvermoon, Skullcrusher, Spinebreaker, Stormrage, Stormreaver, Stormscale, Sylvanas, Terenas, The Maelstrom, The Venture Co, Thunderhorn, Turalyon, Twisting Nether and Vashj.
While the problem seems to be specific to these realms, Ancilorn didn't elaborate on the precise reasons for the extensive maintenance. He only informed readers that these realms will be offline from 3:00am CEST until around 5:00pm CEST. I suggest this might be a very good time to explore the opposite faction on another server, roll a twink or level that long-neglected alt. We'll certainly keep you updated next week and hopefully the maintenance should run smoothly.