Realm maintenance has been extended. Please help us consolidate discussion regarding this by posting in our sticky thread:
http://us.battle.net/wow/en/forum/topic/7004017485

UPDATE: Maintenance has been extended until 3:00pm PST. Thanks again for your continued patience.
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It has become necessary to extend today’s regularly scheduled maintenance by approximately two hours. We currently anticipate that realms will become available at 1:00 p.m. PST, though we will revise that estimate if the situation changes.

Thank you for your patience in the meantime.