Quarion has posted this information on upcoming maintenance:

We will be performing scheduled database maintenance tomorrow, which is Tuesday, June 12th, between 7am and 12 noon-time. (EDT) During this downtime players will be unable to play and unable to login. This is simply database maintenance and no release notes will be posted. We apologize for any inconvenience and thank you for your patience.

Also note, that in the next few weeks we will be performing additional database maintenance, breaking up the downtime into several sessions. More information will be posted at a later date.