from Sony :
Other new or revised features in version 2.52 (with 2.50):
Users Users

    * You now have an option to set the PS3™ system to turn off automatically after a background download or installation of content has completed. This option is available when you turn off the system under [Users] > [Turn Off System] while content is being downloaded or installed.

Settings Settings

    * [BD/DVD Settings] has been renamed to [Video Settings].
    * Under [Video Settings], the [Cinema Conversion] option has been renamed to [BD/DVD Cinema Conversion] and the [Upscale] option has been renamed to [BD/DVD Upscaler].
    * [Sequential Playback] has been added as an option under [Video Settings].
    * [DivX® VOD Registration Code] has been added under [System Settings]. You must use this registration code to authenticate and register the PS3™ system to be able to play video files that are compatible with the DivX® VOD (Video On Demand) service on your system. For details, visit the DivX® website.
      * DivX, DivX Certified, and associated logos are trademarks of DivX, Inc. and are used under license.
    * [Power Save Settings] has been added as an option under [Settings]. To save power, the PS3™ system and wireless controllers can be set to turn off automatically after a certain period of inactivity.
    * Under [Accessory Settings] > [Audio Device Settings], the method for reconnecting Bluetooth® devices has been changed.
    * Under [Accessory Settings] > [Keyboard Type], you can now choose the following keyboard types: [German Keyboard (Switzerland)], [French Keyboard (Canada)] and [French Keyboard (Switzerland)].
    * Under [Printer Settings] > [Printer Selection], you can now select printers that support network connectivity. You can also select HP printers using the [HP] option.

Music Music

    * You can now select one of nine volume output levels using the [Volume Control] setting on the control panel (or the mini-size control panel).
    * [Pause] has been added as an icon on the mini-size control panel.

Video Video

    * You can now select one of nine volume output levels using the [Volume Control] setting on the control panel.
    * [Scene Search] has been added as an option on the control panel.
    * You can now use the [Mosquito Noise Reduction] setting for video content that is saved on the hard disk or storage media. Use this setting to reduce mosquito noise that appears on the edges of visual images.
    * During BD (BDAV) and DVD playback, a technique known as “chroma upsampling” is now automatically selected based on the movement of objects within the video content and then applied to enhance images in the content.

Game Game

  * New for 2.52: The playback quality of some PLAYSTATION®3 format software has been improved.
    * New for 2.52: A text entry issue that occurs when using the on-screen keyboard, USB keyboard or Bluetooth® keyboard with some

PLAYSTATION®3 format software has been addressed.
    * [Sync with Server] has been added as an option under [Trophy Collection].
    * By pressing the PS button while playing PLAYSTATION®3 format software, you can now view information from the [Settings and Connection Status List] option under [Network Settings].*
      * This feature is not available for use with some PLAYSTATION®3 format software.

Game Network

    * Support for Adobe® Flash® Player 9 has been added to [Internet Browser].*
      * “Adobe” and “Flash” are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States and/or other countries.

PlaySTation Network PlayStation®Network

    * The way to disable the automatic sign-in option and the way to sign out from PlayStation®Network have been changed.
    * In PlayStation®Store, the design of the [View Downloads] and [View Cart] buttons has been changed, and a [Redeem Codes] button has been added.

Friends Friends

    * You can now view information about the most recent sign-in for Friends who are on your Friends list.*
      * If you do not set the correct date and time in the [Date and Time] settings under [Settings] > [Date and Time Settings], this information may not be displayed.