According to this site, servicepack 2 for Sharepoint 2007 and WSS 3 should be available on april 28th.
Some changes / improvements:
- An STSADM command line that scans your server farm to establish whether it is ready for upgrade to the next version of SharePoint and provides feedback and best practice recommendations on your current environment.
SP2 offers support for a broader range of Web browsers.
Substantial improvements to Forms-based authentication.
Windows Server 2008 SP2 and Windows Server R2 will be supported on their release.
Excel Services
-
SP2 makes it easier to configure Excel Web Access Web Parts on new sites.
-
Several rendering, calculation, and security issues have been resolved.
-
Some display issues have been addressed.
-
Improved compatibility with Mozilla Firefox browsers
