The Diablo 4 Patch 1.1 that prepares the game for Season 1 will result in 3-hour maintenance this week. The maintenance will start at 10:00 AM PT and conclude at 1:00 PM PT.
World of Warcraft services will be offline for 1 hour as usual.
Diablo 4 servers will be offline for 3 hours. After that, players will need to download a client patch.