The PlayStation Network will be going offline this Wednesday for scheduled maintenance. The maintenance window will begin at 16:00 BST until 20:30 BST on June 20th 2012 but the reason for maintenance was not given. During the downtime, users will be unable to sign-in to the PSN, PlayStation Store and related services.
As you may already know, the weekly European PlayStation Store updates happen on Wednesdays, so the Store will be offline until the maintenance has been completed. Sony also say that there may be “some additional downtime” after the maintenance period for “testing purposes”.