Sony's latest Firmware seems to have added yet another feature to the PlayStation 3 - a new PSN wide notification system.
A PS3 user has received a message from a sender with the PSN id: [PSN] regarding an issue with a PSN title. The message contained an attachment that linked to the game on the PSN Store, indicating that the message came from Sony.
The new system seems to allow Sony to communicate with PlayStation Network at large, or perhaps a certain group of users.
The latest PS3 firmware was originally dismissed as insignificant, but it was quickly discovered that the update added a new patching system, making this the second hidden feature to be included.
However, the firmware also introduced a rather annoying bug that caused a number of HDD issues.