It would appear that Wikipedia has the latest information: http://en.wikipedia.org/wiki/Microsoft_Office_2010
In the short section regarding the Mac version, it starts off with:
"Microsoft has announced that the Mac OS X version will also be released in
2010. Microsoft Office 2011 for Mac will include more robust enterprise
support and greater feature parity with the Windows edition. ..."
It also says that VBA support will return, and Office will include Outlook
vs Entourage.
While you're waiting for Mac Excel 2011, if you're having problems with Mac
Excel 2008, I suggest that you (a) be sure to update to the latest version,
currently 12.2.4, and then run the Mac Disk Utility to repair permissions,
and (b) post questions about your specific problems in the very active
newsgroup microsoft.public.mac.office.excel.
