In a nutshell. They found a way to get EAX to work on Vista.
Quote:
| Creative told us that the driver is expected to be completed by December, a month before Windows Vista is due to launch, and will support all Creative X-Fi sound cards. However, older Audigy and Sound Blaster sound cards will not be supported initially, which means that the only way to get high-quality positional audio in Windows Vista is to buy an X-Fi. |