Sony has announced that PlayStation Network will be offline on Thursday, starting 4.00PM BST through to Friday morning, around 8:00AM BST. PSN is being shut down for maintenance, according to Sony.
This means that the PlayStation Store, PSN Account Management and PSN Account Registration will be inaccessible, as well as online play. However, gamers who are online when PSN goes down will remain online and able to play games.
Sony did not reveal what the publisher was performing maintenance on, but judging by the frequency of these maintenance outages, one might guess it has something to do with security.