This is the beta. Here are the release notes.
While we are still working out exactly how to distribute the final Player version to be as easy as possible for the typical end user, this beta includes 2 gzip’d tarball packages: one is for the Mozilla plugin and the other is for a GTK-based Standalone Flash Player. Either will need to be downloaded manually via the Adobe Labs website and unpacked. The standalone Player (gflashplayer) can be run in place (after you set its executable permission). The plugin is dropped into your local plugin directory (for a local user) or the system-wide plugin directory.
More thorough instructions are available in the individual packages. Go to this page to make sure it worked. The version should read 9,0,21,55.
Please note that bug reports will not be accepted in the comments of this blog. There is a more appropriate place for bug reports (check the forums and bug/feature request form).