After loads and loads of speculation and rumours over the past couple of weeks, Microsoft has just publically released the BETA version of the Service Pack 2 for Windows Vista.
The initial BETA releases supports five different languages - English, French, German, Japanese, and Spanish. It will not work on operating systems with other languages, don't bother trying. You can download x64 SP2 here (615MB) and x86 SP2 here (389MB).
Below is a list of the main new features in SP2, keep in mind though that it also includes a whole stack of bug fixes and patches, which you can see here.
Support for Bluetooth 2.1
Improved Blu-ray support
exFAT file system for USB sticks
Support for Via 64 Bit processors
Solution for WLAN problems after S3
Windows Search 4.0
Faster RSS gadget
Proceed with caution and as always, backup all important data before installing SP2 BETA.