From War Herald:
"All servers will be brought offline tomorrow as we release the Knight of the Blazing Sun and the Black Guard to all players!
Starting at 9AM EST North American servers will brought down with Oceanic servers to follow at 10:30AM EST. We anticipate all servers to be back online by 12 Noon EST with the North American servers coming up shortly before Oceanic.
Don't forget, you can play these careers and all of the current changes slated for 1.1 right now on the Public Test Server!"