We have it on good authority (meaning this is a rumor, and good authority could mean anything) that Apple is ready to drop its final update to yesterdays OS, aka Tiger. Thats right. 10.4.12 is allegedly ready to roll, and will spring forth in the next couple weeks or so.
The site claims to not have specifics beyond "numerous bug fixes and security enhancements". It should be noted that there have yet to be any leaks regarding 10.4.12 development from traditionally reliable sources, which may shed some doubt upon the claims.
Apple released Mac OS 10.4.11 in November.