The PlayStation Network will be undergoing maintenance tomorrow, Tuesday the 25th of August. As a result you will be unable to sign in to the PSN between 4:15pm and 9:05pm UK time. The maintenance window is global. If you’re already signed in before the maintenance begins, however, you should be able to stay connected to the PSN servers. It is likely that you’ll be disconnected and required to sign back in once the PSN comes back up at 9:05pm, though.
With exactly a week to go from tomorrow, is Sony preparing for Firmware update 3.0 and the PS3 Slim? No details about the maintenance period were given so we will just have to wait and see tomorrow to see what has changed.