Here are the latest Fuji X100 updates from a recent Q&A session:
The Silkypix software (included with the X100) will be available for both Windows and Mac.
You can also see some processed X100 RAW files in this dpreview thread.
Currently only Amazon is taking Fuji X100 pre-orders, US shipments should start in the next 1-3 weeks. The X100 is already shipping in Japan.