Sony has just launched firmware 3.15.  No, there is not cross game voice chat.  There is, however, an added option allowing you to transfer data directly from PS3 to PS3, including those meddlesome protected game saves that can't be transferred any other way.  Much like the more recent 3.01 patch, 3.15 is completely optional.

Here's the full run down from Sony:

Data Transfer Utility

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.