Mac OS X 10.4 (8A425) - Final Candidate?
The most recent build is 8A425. Final candidates are considered to be complete/ready versions of software development. If no further issues are determined, the final candidate may be declared Gold Master -- which will be the shipping version of the product.
Mac OS X 10.4 (Tiger) is expected to ship in mid-April, with a rumored announcement this Friday (April 1).