Playstation writes:

The PS3 will receive its next system software update shortly – v. 3.15. This is an optional update, and it enables existing PS3 owners who purchase a new PS3 system (perhaps as a second unit for the household) to transfer their content from their current PS3 to the new system. Content such as games, game save data, and videos downloaded from PlayStation Network can be transferred to the new PS3 system and deleted from the current PS3 system. Other content, including personal media files (photos, music, videos), can be copied onto the new PS3 and remain on the current PS3 system.

Data Transfer Utility Explained:

1. Turn both the current PS3 (A) and new PS3 (B) on and connect them with a LAN cable; PS3 (A) should be connected to the TV. Please note, firmware (v3.15) must be installed on both systems.

2. On the XMB of PS3 (A), scroll to the Settings category and select [System Settings] and then [Data Transfer Utility]

3. Follow the instructions on-screen and transfer data

4. After transferring the data, follow the instructions on-screen, and then connect PS3 (B) to the TV to view the XMB

5. If content that was downloaded from PlayStation Store was transferred as part of this operation, you must activate PS3 (B) before you can use the data. Log in to the PS3 system as the user who owns the content, and then select (PlayStation Network) > (Account Management) > (System Activation) to activate the system.

More details on Data Transfer Utility will be available here once the firmware updat