http://wccftech.com/destiny-2-servers-down-patch-1-0-1-3/

Destiny 2 servers on PS4 and Xbox One are down for scheduled maintenance and the release of update 1.0.1.3. Release notes for the update will be released shortly.

Bungie announced the 1.0.1.3 update, which should address “some issues”, last week, but the exact contents of the patch are unknown. The official patch details will be released as soon as the update has been deployed.