A release candidate for Jython 2.2.1, a bugfix release of 2.2, is available for download: http://downloads.sourceforge.net/jython/jython_installer-2.2.1rc1.jar See http://jython.org/Project/installation.html for installation instructions.
The biggest change in this release is that file reading and writing will no longer be run through the current JVM's default charset. In the 2.2 release, the bytes read in from a file opened in text mode would be decoded by the default charset and then when written out, bytes would be encoded using the same default charset. In 2.2.1rc1, read returns unadulterated bytes and write doesn't automatically encode the bytes it's writing.
A full list of changes is available at http://jython.org/NEWS
If no new problems are found in this candidate, 2.2.1 will be released a week from now.