Looks like Mac Office 2004 has been released to manufacturing. Congratulations to Rick Schaut, fellow Sloanie Angela Liao, and the other folks in the MacBU for completing this release.
Rick notes that there have been some advances in how Mac Word 2004 handles Unicode text, support for table styles, line layout across platforms, and (yes) long file names. Still no XML support, though.
For more info on Mac Office 2004, see MacWorld, our own Mac information site, and MacNN.