You may have been notified of the release of 2.0.4, or you may have found the files available for download somewhere. In all cases 2.0.4 has NOT been released and you are advised to not install or update it.
If you have it isn't a major problem, some files will have been further fixed and you will need to update these (simply obtain the changed files only package when it becomes available and use the 2.0.3_to_2.0.4 archive to replace all affected (and several unaffected) files).
Only when the download page is updated here is a release deemed "official". Till that time any releases you find should be classed as "CVS" quality.