Now that the source code has been released, the open source software community can work to fix the bugs and make the driver more robust. The source code is available for download from a Creative's support forums, but the developers say that it is not yet ready for user on production systems. It supports ALSA PCM playback, recording, and mixing, but doesn't support external I/O modules. Users who are already testing the drivers are experiencing mixed results. For some, it doesn't appear to be working yet.
For more details about the new driver and some background information about the status of previous X-Fi support and driver development efforts, read the detailed overview at Phoronix.