Hellgate: London Patch 1.3d will be live on the Shulgoth (US) and Sydonai (EU) servers tomorrow, July 9th. The Shulgoth (US) server will update at 10:00 AM PDT and the Sydonai (EU) server will update at 8:00 PM PDT (0300 July 10th GMT). The downtime for each server will be about one hour.
Both servers will resume normal service after the update. Patch notes for Patch 1.3d are available here.