The Service Pack 2 for MOSS 2007, WSS 3.0 and Office 2007 will release on the 28th of April 2009. This announcements was made on the Office team blog, along with an introduction to some of the fixes / features added.
My top improvements are:
- Support ODF 1.1 in Office 2007 (for read and save as)
- Added 'Save as PDF' in Office 2007 (so no need to download a add-in anymore)
- Improvements to Forms-based authentication via WSS
- Support for a broader range of Web browsers