Sony has revealed that the PlayStation Network is due to go down for maintenance for a 14 hour period on Monday, September 10th. The maintenance period spans from 8am PT to 10pm PT (or 11am ET to 1am ET on the 11th).
The post notes that “If you’ve signed onto PSN over the past few days, you’ll still be able to play online and access apps during this period, but you may receive a maintenance notification when attempting to access the PlayStation Store, PlayStation Home, and Account Management as these services will be unavailable.” As such, “Be sure to sign in now if you wish to access the Network during this maintenance window.”
This maintenance warning was posted on the North American PlayStation Forums, so it’s unclear if it will affect other territories. However, PlayStation Network outages and maintenance periods typically do affect all territories.